- Type of paper
: Paper in book
Title: Organic Superconductors: Anisotropic Molecular Metals
- Authors:
- Friend, R.H.
- Cooper, John Robert (7044)
- Editors
- Evetts, J.E.
Publisher: Pergamon Press
Year: 1992
Pages: from 0 to 0
Language: engleski
- Type of paper
: Paper in book
Title: Organic Superconductors: Doped C60 (Fullerene)
- Authors:
- Friend, R.H.
- Cooper, John Robert (7044)
- Editors
- Evetts, J.E.
Publisher: Pergamon Press
Year: 1992
Pages: from 0 to 0
Language: engleski
- Type of paper
: Paper in book
Title: A Simple Physical Picture for the Thermoelectric Power and
Hall Effect of High-Tc Oxides
- Authors:
- Cooper, John Robert (7044)
- Carrington, A.
- Editors
- Bando, Y.
- Yamauchi, H.
Publisher: Springer-Verlag
Year: 1993
Pages: from 95 to 100
Language: engleski
- Type of paper
: Paper in book
Title: Mapping and Exploiting the Superconducting Phase Diagram
in High-Tc Cuprates
- Authors:
- Tallon, J.L.
- Cooper, John Robert (7044)
- Editors
- Bando, Y.
- Yamauchi, H.
Publisher: Springer-Verlag
Year: 1993
Pages: from 339 to 344
Number of references: 24
Language: engleski
Summary: The hole-doped high-Tc cuprates have a superconducting
phasediagram which can be effectively mapped by two variables.Firstly, Tc
has a universal dependence upon doped holeconcentration. Secondly, the
maximum Tc at optimum doping,Tc(max) appears to be dependent on charge
distribution within theCuO2 plane and on the state of stress of the plane,
both of whichare conveniently described in a single bond valence
sumparameter. These ideas are illustrated in relation to cationdoping,
oxygen stoichiometry and the effects of pressureparticularly with reference
to the thermoelectric power. It isshown that this phase behaviour can be
exploited to manipulateand optimise transition temperatures.
Keywords: phase diagram, structure, doping, Tc, thermopower
- Type of paper
: Paper in book
Title: NMR Study of Spin Fluctuations in YBa2Cu3O6+x
- Authors:
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
- Editors
- Oguchi, T.
- Kadowaki, K.
- Sasaki, T.
Publisher: Elsevier
Year: 1992
Pages: from 347 to 351
Language: engleski
- Type of paper
: Paper in book
Title: NMR Investigation of Low-Energy Excitations in YBa2Cu3O6+x
Single Crystals
- Authors:
- Auler, T.
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
- Editors
- Kuzmany, H.
- Mehring, M.
- Fink, J.
Publisher: Springer-Verlag
ISBN: 3-540-56195-1
Year: 1993
Pages: from 168 to 174
Number of references: 33
Language: engleski
- Type of paper
: Paper in book
Title: Organic Metals
- Authors:
- Cooper, John Robert (7044)
- Korin-Hamzić, Bojana (61314)
- Editors
- Farges, J.P.
Publisher: Marcel Dekker Inc.
ISBN: 0-8247-9216-5
Year: 1994
Pages: from 359 to 403
Number of references: 128
Language: engleski
Summary: This chapter is devoted to some of the basic physical
properties of those organic metals that are formed from large planar
molecules such as the TTF (tetrathiafulvalene) molecule and its
derivatives. Many hundreds of such organic conductors have been synthesized
since the early 1970s when transport and structural studies of single
crystal of TTF-TCNQ first caught the imagination of organic chemists,
crystallographers and solid-state physicists.
Keywords: organic conductors, low-dimensional conductors, physical properties
- Type of paper
: Paper in journal
Title: Normal State Magnetic Susceptibility of Some High Tc
Oxides
- Authors:
- Cooper, John Robert (7044)
Journal: Supercond.Sci.Techno.
ISSN: 0953-2048
Volume: 4
Year: 1991
Pages: from 181 to 183
Language: engleski
- Type of paper
: Paper in journal
Title: A Study of the Split Transition in YBa2Cu3O7-d Specific
Heat and Resistivity Measurements
- Authors:
- Loram, J.W.
- Cooper, John Robert (7044)
- Mirza, K.A.
Journal: Supercond.Sci.Techno.
ISSN: 0953-2048
Volume: 4
Year: 1991
Pages: from 391 to 393
Language: engleski
- Type of paper
: Paper in journal
Title: Evidence for Matthiessen's Rule in the Normal State
Resistivity of Zinc Doped YBCO
- Authors:
- Cooper, John Robert (7044)
- Obertelli, S.D.
- Freeman, P.
- Zheng, D.
- Loram, J.W.
- Liang, W.
Journal: Supercond.Sci.Techno.
ISSN: 0953-2048
Volume: 4
Year: 1991
Pages: from 277 to 279
Language: engleski
- Type of paper
: Paper in journal
Title: Effect of Oxygen Depletion on the Transport Properties of
YBa2Cu3O7-d
- Authors:
- Cooper, John Robert (7044)
- Obertelli, S.D.
- Carrington, A.
- Loram, J.W.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 44
Year: 1991
Pages: from 12086 to 12089
Number of references: 27
Language: engleski
- Type of paper
: Paper in journal
Title: Low Temperature Hall Effect in Bi2Sr2CuO6-d
- Authors:
- MacKenzie, A.P.
- Hughes, S.D.
- Cooper, John Robert (7044)
- Carrington, A.
- Chen, C.
- Wanklyn, B.M.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 45
Year: 1991
Pages: from 527 to 530
Number of references: 17
Language: engleski
- Type of paper
: Paper in journal
Title: Single Crystal Hall and Stoichiometry in Bi2Sr2CuO6
- Authors:
- Hughes, S.D.
- MacKenzie, A.P.
- Cooper, John Robert (7044)
- Carrington, A.
- Edmends, J.S.
Journal: Physica C
ISSN: 0921-4534
Volume: 185
Year: 1991
Pages: from 1243 to 1244
Language: engleski
- Type of paper
: Paper in journal
Title: Critical Behaviour in the Resistivity of
Y1-xCaxSr2Cu2Tl0.5Pb0.5O7
- Authors:
- Loram, J.W.
- Cooper, John Robert (7044)
- Liu, R.S.
- Mirza, K.A.
- Liang, W.
- Wade, J.M.
Journal: Physica C
ISSN: 0921-4534
Volume: 186
Year: 1991
Pages: from 1751 to 1752
Language: engleski
- Type of paper
: Paper in journal
Title: Non-Ohmic Electrical Transport in the Spin-Density Wave
State of the Organic Conductors (TMTSF)2X
- Authors:
- Tomić, Silvia (65594)
- Cooper, John Robert (7044)
- Kang, W.
- Jerome, D.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 43
Year: 1991
Pages: from 4007 to 4013
Number of references: 9
Language: engleski
Summary: We report the electric-field-dependent conductivity above
afinite threshold field (ET) in the spin-density wave (SDW) stateof the
organic conductors (TMTSF)2X, X=NO3, PF6. ET istemperature independent
below half of the transition temperature(Tc). For most pristine PF6 samples
ET increases substantiallytowards Tc, while for irradiated samples this
rise becomes muchsmaller. The value of ET increases linearly with
defectconcentration and the magnitude of field-dependent
conductivitystrongly decreases. We discuss our results in the framework
ofthe Maki's theory for the sliding SDW becoming depinned above afinite
electric field and being responsible for theelectric-field-dependent
response.
- Type of paper
: Paper in journal
Title: Shubnikov-de Haas Oscillations in Organic Conductors
- Authors:
- Cooper, John Robert (7044)
- Kang, W.
- Jerome, D.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 42
Year: 1991
Pages: from 2467 to 2473
Number of references: 10
Language: engleski
Summary: Anomalously large quantum oscillations found in the
organicsuperconductor betha-(BEDT-TTF)2I3 are summarized. Theoscillatory
amplitude which is ten times larger than the residualresistance and very
enhanced anharmonicity are unique among thestudies performed on
(BEDT-TTF)2X family. Observed results showthat we have an almost perfect
two-dimensional system. Theabnormally enhanced third harmonic observed in
certaincircumstance is analyzed with a relation to the splittingmechanism.
We developed also a new model to explain the splittingof Shubnikov-de Haas
oscillations.
- Type of paper
: Paper in journal
Title: Field-Induced Phase Transitions and Quantized Hall Effect
in the Organic Superconductors (TMTSF)2X; X=PF6, ReO4
- Authors:
- Cooper, John Robert (7044)
- Kang, W.
- Jerome, D.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 42
Year: 1991
Pages: from 1991 to 1992
- Type of paper
: Paper in journal
Title: New Results on the Phase Diagram of the (TMTSF)2FSO3 Salt
- Authors:
- Auban, P.
- Čelebonović, V.
- Tomić, Silvia (65594)
- Jerome, D.
- Bechgaard, K.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 42
Year: 1991
Pages: from 2281 to 2284
Number of references: 5
Language: engleski
Summary: We present transport measurements under pressure on
the(TMTSF)2FSO3 salt from p=1bar to 8kbar using a helium gaspressure cell,
in order to clarify the pressure-temperature phasediagram of this compound.
The interest in this TMTSF salt comesfrom the existence of
non-centrosymmetric tetrahedral anion witha permanent dipole moment related
to the presence of the fluorineatom. Two types of disorder can be involved
in the metal toinsulator transitions at low temperature: one due to
theorientation of the tetrahedra and the second to the position ofthe
fluorine atom inside the anion. For all studied pressures asemiconducting
phase occurs at T=90K via a sharp transition. Atlower temperatures, the
activation energy decreases as thepressure is increased. At last, the
resistivity saturates atp=8kbar from T=80K down to 10K where the metallic
state isrestored. This new study shows that phase diagrams derived withthe
use of the clamped pressure techniques should be revised.
- Type of paper
: Paper in journal
Title: Temperature Dependent Hall Coefficient in the Organic
Superconductor betha-(BEDT-TTF)2I3
- Authors:
- Korin-Hamzić, Bojana (61314)
- Forro, L. (114515)
- Cooper, John Robert (7044)
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 42
Year: 1991
Pages: from 2119 to 2123
Number of references: 8
Language: engleski
Summary: We report Hall effect data (RH) for two single crystals of
theorganic superconductor betha-(BEDT-TTF)2I3 in the low Tc phase.An
unexpected temperature dependence is obtained with a broadmaximum in RH
near 40K. A possible interpretation in terms ofelectron-electron scattering
is discussed.
- Type of paper
: Paper in journal
Title: Non-Linear Conductivity in the
Field-Induced-Spin-Density-Wave States of the Organic Conductor (TMTSF)2PF6
- Authors:
- Kang, W.
- Cooper, John Robert (7044)
- Jerome, D.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 42
Year: 1991
Pages: from 2083 to 2087
Number of references: 13
Language: engleski
Summary: We report the first non-umbiguous measurement of the
non-linearconductivity in the field-induced-spin-density wave (FISDW)
stateof the organic conductor (TMTSF)2PF6. The general characteristicsof
the non-linear conduction is similar to that found in ambientpressure SDW
state. Threshold field (ET) is found in the range of1-25mV/cm. It increases
with magnetic field but shows also avalley between two phases, which is
probably related to thereentrance of phase boundary that is observed in
(TMTSF)2ClO4.For a given magnetic field, ET shows a broad maximum around
1.2Kand decreases on further heating.
- Type of paper
: Paper in journal
Title: A Hidden Low-Temperature Phase in the Organic Conductor
(TMTSF)2ReO4
- Authors:
- Tomić, Silvia (65594)
- Jerome, D.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 42
Year: 1991
Pages: from 1948 to 1949
Language: engleski
- Type of paper
: Paper in journal
Title: Transport Properties of Several Series of High Tc Oxides
- Authors:
- Cooper, John Robert (7044)
- Obertelli, S.D.
- Carrington, A.
- Loram, J.W.
- Liang, W.
Journal: Physica C
ISSN: 0921-4534
Volume: 185
Year: 1991
Pages: from 1265 to 1266
Language: engleski
- Type of paper
: Paper in journal
Title: Microscopic Aspects of Cobalt-Doping in YBa2Cu3O7-d: an
NMR Study
- Authors:
- Webster, W.J.
- Tunstall, D.P.
- Freeman, P.
- Cooper, John Robert (7044)
Journal: Physica C
ISSN: 0921-4534
Volume: 185
Year: 1991
Pages: from 1079 to 1080
Language: engleski
- Type of paper
: Paper in journal
Title: Critical and Gaussian Fluctuation Effects in teh Specific
Heat and Conductivity of High Tc Superconductors
- Authors:
- Loram, J.W.
- Cooper, John Robert (7044)
- Wheatley, J.M.
- Mirza, K.A.
- Liu, R.S.
Journal: Phil.Mag.B
ISSN: 0141-8637
Volume: 65
Year: 1992
Pages: from 1405 to 1417
Language: engleski
- Type of paper
: Paper in journal
Title: The Thermoelectric Power of Noble Metal Spin Glass Alloys
- Authors:
- Cooper, John Robert (7044)
- Ford, P.J.
Journal: Phil.Mag.B
ISSN: 0141-8637
Volume: 65
Year: 1992
Pages: from 1275 to 1281
Language: engleski
- Type of paper
: Paper in journal
Title: Giant Tunneling Anisotropy in the High-Tc Bi2Sr2CaCu2O8
- Authors:
- Mandrus, D.
- Forro, L. (114515)
- Koller, D.
- Mihaly, L.
Journal: Nature
ISSN: 0028-0836
Volume: 351
Year: 1991
Pages: from 460 to 462
Language: engleski
- Type of paper
: Paper in journal
Title: Two-Dimensional Electron Localization in Bulk Single
Crystals of Bi2Sr2YxCa1-xCu2O8
- Authors:
- Mandrus, D.
- Forro, L. (114515)
- Kendziora, C.
- Mihaly, L.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 44
Year: 1991
Pages: from 2418 to 2421
Number of references: 24
Language: engleski
- Type of paper
: Paper in journal
Title: High Pressure Study of YBa2Cu3O7-x
- Authors:
- Ilakovac, Vita
- Forro, L. (114515)
- Ayache, C.
- Henry, J.Y.
Journal: Phys.Lett.A
ISSN: 0375-9601
Volume: 161
Year: 1991
Pages: from 314 to 318
Number of references: 13
Language: engleski
Summary: We report measurements of the in-plane and
out-of-planeresistivity for YBa2Cu3O7-d high temperature
superconductingsingle crystals under hydrostatic pressure uo to 20kbar.
In-planeresistivity has an initial derivative dlnR/dp of -1%/kbar, whilefor
out-of-plane resistivity dlnR/dp is -1.5%/kbar at roomtemperature. The
superconducting transition temperature in bothconfigurations increases by
0.055K/kbar in the pressure rangeexplored.
- Type of paper
: Paper in journal
Title: Electron Relaxation Rate in High-Tc Superconductors below
Tc
- Authors:
- Mandrus, D.
- Forro, L. (114515)
- Koller, D.
- Kendziora, C.
- Mihaly, L.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 46
Year: 1992
Pages: from 8632 to 8634
Number of references: 19
Language: engleski
- Type of paper
: Paper in journal
Title: On the Phenomenology of the Infrared Properties of the
Copper-Oxide Superconductors
- Authors:
- Romero, D.B.
- Porter, C.D.
- Tanner, D.B.
- Forro, L. (114515)
- Mandrus, D.
- Mihaly, L.
- Carr, G.L.
- Williams, G.P.
Journal: Solid State Commun.
ISSN: 0038-1098
Volume: 82
Year: 1992
Pages: from 183 to 188
Language: engleski
- Type of paper
: Paper in journal
Title: Resistivity Study of Bi2Sr2YxCa1-xCu2O8 Single Crystals
- Authors:
- Mandrus, D.
- Forro, L. (114515)
- Kendziora, C.
- Mihaly, L.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 45
Year: 1992
Pages: from 12640 to 12642
Number of references: 20
Language: engleski
Summary: We have measured the resistivity on a number of
high-qualitysingle crystals of Bi2Sr2Ca1-xYxCu2O8 with x ranging from 0
to0.50. The effects of increasing x are (1) Tc falls sharply anddisappears
at x=0.40+/-0.05, (2)the onset of linear behaviour inresistivity shifts to
higher temperatures, (3)the hightemperature slope dR(T)/dT increases, and
(4)the residualresistivity (normalized to the carrier density)
satisfiesMatthiessen's rule up to x=0.40. Localization effects set inabove
this value.
- Type of paper
: Paper in journal
Title: Out of Plane Conductivity of YBa2Cu3O7
- Authors:
- Forro, L. (114515)
- Ilakovac, Vita
- Cooper, John Robert (7044)
- Ayache, C.
- Henry, J.Y.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 46
Year: 1992
Pages: from 6626 to 6629
Number of references: 21
Language: engleski
- Type of paper
: Paper in journal
Title: Magnetic Nuclear Spin-Lattice Relaxation in NMR of
Orthorombic Crystals in the Presence of Strong Quadrupolar Coupling
- Authors:
- Horvatić, M. (112333)
Journal: J.Phys:Condens.Matter
ISSN: 0953-8984
Volume: 4
Year: 1992
Pages: from 5811 to 5824
Number of references: 14
Language: engleski
- Type of paper
: Paper in journal
Title: From Underdoped to Overdoped Regime in YBa2Cu3O6+x : An
NMR Investigation of Single Crystals
- Authors:
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
Journal: Appl.Magn.Reson.
Volume: 3
Year: 1992
Pages: from 449 to 468
Language: engleski
- Type of paper
: Paper in journal
Title: 17O Nuclear Spin-Lattice Relaxation in YBa2Cu3O6+deltha
Single Crystals
- Authors:
- Horvatić, M. (112333)
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Segrensan, P
- Henry, J.Y.
Journal: Physica C
ISSN: 0921-4534
Volume: 185
Year: 1991
Pages: from 1139 to 1140
Language: engleski
- Type of paper
: Paper in journal
Title: NMR Study of Spin Fluctuations in YBa2Cu3O6+d
- Authors:
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
Journal: Physica C
ISSN: 0921-4534
Volume: 185
Year: 1991
Pages: from 1141 to 1142
Language: engleski
- Type of paper
: Paper in journal
Title: 17O and 63Cu NMR Study of Anisotropic Magnetic
Fluctuations in a Single Crystal of YBa2Cu3O6+deltha : Comparison with
Neutron Diffraction
- Authors:
- Clark, W.G.
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Henry, J.Y.
- Horvatić, M. (112333)
- Segrensan, P
Journal: J.Magn.Magn.Mater.
ISSN: 0304-8853
Volume: 104
Year: 1992
Pages: from 589 to 590
Language: engleski
- Type of paper
: Paper in journal
Title: Hall Effect and Resistivity of Oxygen Deficient
YBa2Cu3O7-d Thin Films
- Authors:
- Carrington, A.
- Walker, D.J.C.
- MacKenzie, A.P.
- Cooper, John Robert (7044)
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 48
Year: 1993
Pages: from 13051 to 13059
Number of references: 41
Language: engleski
- Type of paper
: Paper in journal
Title: Temperature Dependent Magnetic Penetration Depth of Co and
Zn Doped YBa2Cu3O7 Obtained from AC Susceptibility of Magnetically Aligned
Powders
- Authors:
- Porch, A.
- Cooper, John Robert (7044)
- Zheng, D.
- Waldram, J.R.
- Campbell, A.M.
- Freeman, P.
Journal: Physica C
ISSN: 0921-4534
Volume: 214
Year: 1993
Pages: from 350 to 358
Number of references: 43
Language: engleski
Summary: We have measured the absolute value and temperature
dependence ofthe magnetic penetration depth lambda(T) of magnetically
alignedcobalt and zinc doped YBa2Cu3O7-d using a commercial
ACsusceptometer. For YBCO, our values of lambda(ab,0)=140nm
andlambda(c,0)=1040nm agree with other published values. We findthat
increasing the Co doping increases both the fluctuationeffects and the
anisotropy ratio lambda(c)/lambda(ab), probablydue the reduction of
coupling in the c direction, while dopingwith Zn substantially increases
both lambda(ab) and lambda(c).Our data imply a large, highly anisotropic
gap whose maximumvalue is 2delta(0)=10kBTc. All samples show a T2 term in
bothlambda(ab,T) and lambda(c,T) at low temperatures (T<0.6Tc), inapparent
disagreement with conventional s-wave BCS pairing. Thepossible explanations
of this result are discussed.
- Type of paper
: Paper in journal
Title: Cu NMR and NQR Study of Impurity-Doped YBa2Cu3O7
- Authors:
- Ishida, K.
- Kitaoka, Y.
- Ogata, N.
- Kamino, T.
- Asayama, K.
- Cooper, John Robert (7044)
- Athanassopoulou, N.
Journal: Physica B
Volume: 186
Year: 1993
Pages: from 1015 to 1017
Language: engleski
- Type of paper
: Paper in journal
Title: Cu NMR and NQR Studies of Impurity-Doped YBa2(Cu1-xMx)3O7
(M=Zn and Ni)
- Authors:
- Ishida, K.
- Kitaoka, Y.
- Ogata, N.
- Kamino, T.
- Asayama, K.
- Cooper, John Robert (7044)
- Athanassopoulou, N.
Journal: J.Phys.Soc.Jpn.
ISSN: 0031-9015
Volume: 62
Year: 1993
Pages: from 2803 to 2818
Language: engleski
- Type of paper
: Paper in journal
Title: Linear Temperature Dependence of the Transverse Electrical
Resistivity of Organic Metals Arising from Electron-Electron Umklapp
Scattering
- Authors:
- Batistić, I.
- Korin-Hamzić, Bojana (61314)
- Cooper, John Robert (7044)
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 48
Year: 1993
Pages: from 16849 to 16852
Number of references: 16
Language: engleski
Summary: We have calculated the electron-electron scattering
contributionto the electrical resistivity in the two transverse
directionsfor an anisotropic tight-binding cosine band. This type of
bandstructure is thought to apply to organic metals such as theBechgaard
salts. Simple expressions for transverse resistivitywere obtained using the
standard variational method. In all caseswe found (alphaT + bethaT
squared).For the b direction alpha=tbon(-2) and betha=tb on (-3), and for
the c axis alpha=tc on (-2)while the expression for betha is more
complicated. The aboveformulas are compared with experimental data and the
effectiveCoulomb interaction for the Bechgaard salts is found to
beU=0.64eV.
- Type of paper
: Paper in journal
Title: Nonlinear Hall Effect in the Field-Induced Spin-Density
Wave States of (TMTSF)2PF6
- Authors:
- Balicas, L.
- Biškup, Neven (179286)
- Kriza, G.
Journal: Journal de Physique IV, C2
ISSN: 1155-4339
Volume: 3
Year: 1993
Pages: from 319 to 322
Number of references: 14
Language: engleski
Summary: The resistivity along the conducting chains and the
Hallresistivity are investigated as a function of the electric fieldin the
magnetic-field-induced spin-density wave (FISDW) states of(TMTSF)2PF6 under
hydrostatic pressure. Both resistivitiesdecrease with increasing electric
field above the same welldefined threshold electric field in the order of
100mmV/cm. Weinterpret the nonlinearity by the depinning and sliding of
theFISDW. The nonlinearity in the Hall resistivity is much strongerthan in
the longitudinal one what we attribute to an unusuallystrong coupling
between the FISDW and single-particleexcitations.
- Type of paper
: Paper in journal
Title: Magnetic Field Influence on the Low and High Electric
Field Transport in the Spin-Density Wave State of the Organic Conductor
(TMTSF)2NO3
- Authors:
- Basletić, Mario (197593)
- Biškup, Neven (179286)
- Tomić, Silvia (65594)
- Korin-Hamzić, Bojana (61314)
- Hamzić, Amir (15234)
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 56
Year: 1993
Pages: from 2593 to 2598
Number of references: 12
Language: engleski
Summary: We have studied the influence of the magnetic field in the
planeperpendicular to the highly conducting axis on the ohmic andnon-ohmic
electrical transport in the spin-density wave state of(TMTSF)2NO3. In
particular, we report (1)the angular dependenceof the magnetoresistance at
different temperatures and in lowelectric fields and (2)magnetic field
dependence of teh thresholdelectric field for the non-ohmic conductivity.
We discussobtained results and compare them with the behaviour found in
thespin-density wave state of the other (TMTSF)2X compounds.
- Type of paper
: Paper in journal
Title: Influence of Electron-Electron Scattering on the
Electrical Conductivity in Organic Conductors
- Authors:
- Biškup, Neven (179286)
- Dolanski Babić, Sanja (188231)
- Korin-Hamzić, Bojana (61314)
- Tomić, Silvia (65594)
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 56
Year: 1993
Pages: from 1762 to 1767
Number of references: 12
Language: engleski
Summary: We have measured electrical resistance of the organic
conductorswith different anisotropy in the wide temperature range:
quasione-dimensional (TMTSF)2X (X=ClO4, PF6 and NO3) andtwo-dimensional
betha-(BEDT-TTF)2AuI2. We have looked for the Tsquared temperature
dependence of the resistivity which isexpected for the electron-electron
scattering in the standardtransport theory for isotropic systems. The
agreements are, forall studied materials, satisfactory in the wide
temperatureregion. We discuss and compare electrical resistivity curves
ofthese materials.
- Type of paper
: Paper in journal
Title: Non-Linear Electrical Transport Effects in the Anion
Induced Charge-Density Wave State of the Oragnic Conductors (TMTSF)2ReO4
and (TMTSF)2FSO3
- Authors:
- Biškup, Neven (179286)
- Basletić, Mario (197593)
- Tomić, Silvia (65594)
- Maki, K.
Journal: Synth.Metals
ISSN: 0379-6779
Volume: 56
Year: 1993
Pages: from 2611 to 2616
Number of references: 11
Language: engleski
Summary: We have looked for the electrical field non-linear effects
in thenon-magnetic, semiconducting ground state, induced by the
anionordering, of the organic conductors (TMTSF)2X, X=ReO4, FSO3. Wehave
found that a very small, but finite non-linear contributionto the
conductivity appears above a threshold field of the orderof 1V/cm. We
contrast obtained results with the behaviour usuallyobserved in the
Peierls-induced charge-density wave state.
- Type of paper
: Paper in journal
Title: Gapless Superconductivity in Bi2Sr2CaCu2O8
- Authors:
- Mandrus, D.
- Hartge, J.
- Kendziora, C.
- Mihaly, L.
- Forro, L. (114515)
Journal: Europhysics Letters
ISSN: 0295-5075
Volume: 22
Year: 1993
Pages: from 199 to 204
Number of references: 24
Language: engleski
Keywords: proximity effects, tunneling phenomena, Josephson effect
- Type of paper
: Paper in journal
Title: High Resolution Tests of Low-Dimensionality Effects in
Photoemission
- Authors:
- Coluzza, C.
- Berger, H.
- Almeras, P.
- Gozzo, F.
- Margaritondo, G.
- Indlekofer, G.
- Forro, L. (114515)
- Hwu, Y.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 47
Year: 1993
Pages: from 6625 to 6629
Number of references: 11
Language: engleski
- Type of paper
: Paper in journal
Title: 7Ni-O Chemical Interaction and the Transition Temperature
of Ni-Doped Bi2Sr2caCu2O8
- Authors:
- Almeras, P.
- Keszei, B.
- Berger, H.
- Forro, L. (114515)
- Margaritondo, G.
- Bussy, F.
Journal: Applied Phys.Lett
ISSN: 0003-6951
Volume: 63
Year: 1993
Pages: from 562 to 564
Number of references: 12
Language: engleski
- Type of paper
: Paper in journal
Title: Out-of-Plane Resistivity of Bi2Sr2CaCu2O8 High Temperature
Superconductor
- Authors:
- Forro, L. (114515)
Journal: Phys.Lett.A
ISSN: 0375-9601
Volume: 179
Year: 1993
Pages: from 140 to 144
Number of references: 17
Language: engleski
- Type of paper
: Paper in journal
Title: Wide-Range Oxygen Doping of Bi2Sr2CaCu2O8+d
- Authors:
- Kendziora, C.
- Martin, M.C.
- Hartge, J.
- Mihaly, L.
- Forro, L. (114515)
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 48
Year: 1993
Pages: from 3531 to 3533
Number of references: 17
Language: engleski
Summary: The high-temperature superconductor Bi2Sr2CaCu2O8+d has
beendoped with oxygen at pressures ranging from a few mmbar to 4kbar.The
doping is reversible by heat treatment in air at ambientpressure.
Electrical-resistivity and infrared opticaltransmission measurements
indicate that the carrier densityincreases monotonically with the oxygen
annealing pressure. Thesuperconductor transition goes through a maximum
near 90K and canbe reduced by at least 30K on both sides of the doping
curve. Inthe oxygen-rich material the resistivity in the a-b planeexhibits
a superlinear T on 1+x behaviour while the c-axisresistivity shows a
positive slope in teh temperature dependence.
- Type of paper
: Paper in journal
Title: Tunneling and Infrared Spectroscopy on the High Tc
Superconductors
- Authors:
- Hartge, J.
- Forro, L. (114515)
- Mandrus, D.
- Martin, M.C.
- Kendziora, C.
- Mihaly, L.
Journal: J.Phys.Chem.Solids
ISSN: 0022-3697
Volume: 54
Year: 1993
Pages: from 1359 to 1368
Number of references: 28
Language: engleski
Keywords: tunneling, gap, Josephson current, infrared spectroscopy
- Type of paper
: Paper in journal
Title: High-Pressure Cell for Oxygen Annealing at Elevated
Temperatures
- Authors:
- Mihaly, L.
- Kendziora, C.
- Hartge, J.
- Mandrus, D.
- Forro, L. (114515)
Journal: Rev.Sci.Instrum.
ISSN: 0034-6748
Volume: 64
Year: 1993
Pages: from 2397 to 2400
Language: engleski
- Type of paper
: Paper in journal
Title: NMR Investigation of Single-Crystal YBa2Cu3O6+x from the
Underdoped to the Overdoped Regime
- Authors:
- Horvatić, M. (112333)
- Auler, T.
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Segrensan, P
- Henry, J.Y.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 47
Year: 1993
Pages: from 3461 to 3464
Number of references: 34
Language: engleski
Summary: 17O and 63Cu NMR results obtained in three single crystals
ofYBa2Cu3O6+x, YBa1.92Sr0.08Cu3O7 (Tc=89K) which is overdoped,
andYBa1.93Sr0.07Cu3O6.92 (Tc=91K) and YBa2Cu3O6.52 (Tc=59K) whichare
underdoped, show that the static spin susceptibility and(T1T) on -1 for
Cu(2) and O(2,3) have completely differenttemperature dependence according
to the regime and irrespectiveof Tc. The principal characteristic of the
underdoped regime issupporting the phase diagram based on the spin-charge
separation.The contribution of the antiferromagnetic fluctuations at
theO(2,3) sites have been observed in YBa1.92Sr0.08Cu3O7, in goodagreement
with the inelastic-neutron-scattering results.
- Type of paper
: Paper in journal
Title: Nuclear-Spin-Lattice Relaxation Rate of Planar Oxygen in
YBa2Cu3O6.52 and YBa1.92Sr0.08Cu3O7 Single Crystals
- Authors:
- Horvatić, M. (112333)
- Berthier, C.
- Berthier, Y.
- Segrensan, P
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Henry, J.Y.
Journal: Phys.Rev.B
ISSN: 0163-1829
Volume: 48
Year: 1993
Pages: from 13848 to 13864
Number of references: 49
Language: engleski
- Type of paper
: Paper in journal
Title: Enhanced charge localization in the organic alloys
((TMTSF)1-x(TMTTF)x)2ReO4
- Authors:
- Ilakovac, Vita
- Ravy, S.
- Pouget, J.P.
- Lenoir, C.
- Boubekeur, K.
- Batail, P.
- Dolanski Babić, Sanja (188231)
- Biškup, Neven (179286)
- Korin-Hamzić, Bojana (61314)
- Tomić, Silvia (65594)
- Bourbonnais, C.
Journal: Phys.Rev.B
Number: 10
ISSN: 0163-1829
Volume: 50
Year: 1994
Pages: from 7136 to 7139
Number of references: 19
Language: engleski
Summary: Structural, electrical and magnetic studies of
((TMTSF)1-x(TMTTF)x)2ReO4 alloys are reported. athey exhibit around x=0.5
an enhanced charge localization and a strong decrease of the anion-ordering
(AO) transition temperature. The localization enhancement is attributed to
a 4kF order of charge on the sites due to the alternate order of TMTSF and
TMTTF molecules. This heteropolar charge distribution is suggested to
weaken the 2kF bond response and thus to depress the AO transition.
Keywords: low-dimensional conductors, conductivity, structural studies, magnetic properties
- Type of paper
: Paper in journal
Title: Suppression of the superconducting gap and the
spin-fluctuation gap of YBa2Cu3Oy (y=7.0 and 6.76) by Zn substitution as
measured by Gd3+ electron-spin resonance
- Authors:
- Janossy, A.
- Cooper, John Robert (7044)
- Brunel, L.-C.
- Carrington, A.
Journal: Phys.Rev.B
Number: 5
ISSN: 0163-1829
Volume: 50
Year: 1994
Pages: from 3442 to 3445
Number of references: 15
Language: engleski
Summary: The local susceptibility around Zn atoms in Gd-doped
YBa2(Cu0.97Zn0.03)3Oy has been measured by the electron-spin-resonance
Knight shift of Gd3+ at 245GHz. We have shown that both the superconducting
gap and the spin-fluctuation gap are localy suppressed by Zn substitution.
Keywords: high-temperature superconductors, electron-spin-resonance (ESR)
- Type of paper
: Paper in journal
Title: Discontinuity in the low-field magnetization of
single-crystal Tl2Ba2CuO6 with HIIab
- Authors:
- Hussey, N.E.
- Carrington, A.
- Cooper, John Robert (7044)
- Sinclair, D.C.
Journal: Phys.Rev.B
Number: 17
ISSN: 0163-1829
Volume: 50
Year: 1994
Pages: from 13073 to 13076
Number of references: 19
Language: engleski
Summary: The zero-field-cooled magnetization M(H,T) of a single
crystal of Tl2Ba2CuO6 (Tc=82.5K) has been measured with the field applied
parallel to the CuO2 planes. The data provide strong evidence that
Tl2Ba2CuO6 behaves as a weak-Josephson-coupled layerd superconductor, the
discontinuity (i.e. a large jump in magnetization) arising from the
destruction of Josephson screening currents between the planes at a field
close to the lower critical field.
Keywords: high-temperature superconductors, magnetic properties
- Type of paper
: Paper in journal
Title: Field dependence of the resistive transition in
Tl2Ba2CuO6+d
- Authors:
- Carrington, A.
- MacKenzie, A.P.
- Sinclair, D.C.
- Cooper, John Robert (7044)
Journal: Phys.Rev.B
Number: 18
ISSN: 0163-1829
Volume: 49
Year: 1994
Pages: from 13243 to 13246
Number of references: 13
Language: engleski
Summary: We report measurements of the magnetic-field dependence of
the resistive transition in Tl2Ba2CuO6+d for several crystals with
transition temperatures in the range 15
Keywords: high-temperature superconductors
- Type of paper
: Paper in journal
Title: Influence of grain boundary scattering on the transport
properties of a high Tc oxide superconductor
- Authors:
- Carrington, A.
- Cooper, John Robert (7044)
Journal: Physica C
ISSN: 0921-4534
Volume: 219
Year: 1994
Pages: from 119 to 122
Number of references: 15
Language: engleski
Summary: We report measurements of the resistivity, Hall
coefficient, thermoelectric power and ac susceptibility of a
polycrystalline sample of Co-doped YBa2Cu3O7 in which the grain boundary
resistence could be drastically altered without affecting the properties of
the individual grains. Our results show that although the shape and
magnitude of the resistivity are strongly changed by the increase in
grain-boundary scattering, there is no corresponding effect in either the
thermoelectric power or the Hall coefficient. These results suggest that
measurements of the temperature dependence of the Hall coefficient and
thermoelectric power made on stoichiometric polycristalline samples should
accurately reflect those of the grains.
Keywords: high-temperature superconductors
- Type of paper
: Paper in journal
Title: The electronic specific heat of cuprate superconductors
- Authors:
- Loram, J.W.
- Mirza, K.A.
- Wade, J.M.
- Cooper, John Robert (7044)
- Liang, W.
Journal: Physica C
ISSN: 0921-4534
Volume: 235
Year: 1994
Pages: from 134 to 137
Number of references: 13
Language: engleski
Summary: We presents the electronic specific heat coefficient for
several cuprate series determined from high resolution differential
measurements. The coefficient is consistent with Fermi statistics, a low
degeneracy temperature and at most a modest low temperature mass
enhancement. We show the progression of the coefficinet with hole doping
for La2-ySryCuO4 and the overdoped system Tl2Ba2CuO6+d, and demonstrate
that the rapid fall in condensation energy in underdoped YBa2Cu3O6+x
results from the growth of a pseudogap in the normal state quasiparicle
spectrum. We discuss the effects of Zn doping on superconducting and
pseudogap correlations in YBa2Cu3O6+x.
Keywords: high-temperature superconductors
- Type of paper
: Paper in journal
Title: Variation of the magnetic penetration depth of YBa2Cu3O7-d
with oxygen depletion
- Authors:
- Athanassopoulou, N.
- Cooper, John Robert (7044)
- Chrosch, J.
Journal: Physica C
ISSN: 0921-4534
Volume: 235-
Year: 1994
Pages: from 1835 to 1836
Number of references: 70
Language: engleski
Summary: We report mesurements of the superconducting penetration
depth for YBa2Cu3O7-d in the range 0
Keywords: high-temperature superconductors
- Type of paper
: Paper in journal
Title: Hall effect and thermoelectric power measurements on
Y0.9Ca0.1Ba2Cu3O7-d
- Authors:
- Fisher, I.A.
- de Silva, P.S.I.P.N.
- Loram, J.W.
- Tallon, J.L.
- Carrington, A.
- Cooper, John Robert (7044)
Journal: Physica C
ISSN: 0921-4534
Volume: 235
Year: 1994
Pages: from 1497 to 1498
Number of references: 60
Language: engleski
Summary: Results of Hall effect and thermoelectric power
measurements on sintered samples of Y0.9Ca0.1Ba2Cu3O7-d are presented, and
compared to previous data for sintered samples of YBa2Cu3O7-d and
YxCa1-xSr2(Tl0.5Pb0.5)Cu2O7 (Tl-1212). Results indicate that calcium
substitution in YBCO7-d does not dope holes uniformly for all values of d.
Keywords: high-temperature superconductors
- Type of paper
: Paper in journal
Title: Thermoelectric power of the single layer compound
Bi2.1Sr1.9Cu)6+d
- Authors:
- de Silva, P.S.I.P.N.
- Sinclair, D.C.
- Flower, NE
- Tallon, J.L.
- Cooper, John Robert (7044)
Journal: Physica C
ISSN: 0921-4534
Volume: 240
Year: 1994
Pages: from 1531 to 1532
Number of references: 4
Language: engleski
Summary: The resistivity and thermoelectric power of
Bi2.1Sr1.9CuO6+d (Bi-2201) has been measured as a function of oxygen
deficiency. The transition temperature of the non-superconducting, as
prepared sample can be increased by nitrogen anneals and was raised to a
maximum of Tc=15.5K for the midpoint of the resisteive transition. The
effect on the TEP of lanthanum and lead doping which increases Tc to 32K
has also been studied, and comparison made with the universal curve of Tc
against room temperature thermopower.
Keywords: high-temperature superconductors
- Type of paper
: Paper in journal
Title: Transport properties of zinc-doped YBa2Cu3O7-d thin films
- Authors:
- Walker, D.J.C.
- MacKenzie, A.P.
- Cooper, John Robert (7044)
Journal: Phys.Rev.B
Number: 21
ISSN: 0163-1829
Volume: 51
Year: 1995
Pages: from 15653 to 16656
Number of references: 23
Language: engleski
Summary: We report the results of transport measurements on
single-crystal YBa2(Cu1-xZnx)3O7-d thin films grown by laser ablation.
Matthiessen rule is obeyed as a function of x at optimum doping (d=0.05),
but is violated in underdoped samples. As x and d are increased, Tc drops
rapidly, and a superconductor-insulator transition is observed at a sheet
resistance of approximately h/(4ee) per copper-oxygen bilayer, for various
different combinations of x and d.
Keywords: high-temperature superconductors, conductivity
- Type of paper
: Paper in journal
Title: Resistive upper critical field of thin films of underdoped
YBa2(Cu0.97Zn0.03)3O7-d
- Authors:
- Walker, D.J.C.
- Laborde, O.
- MacKenzie, A.P.
- Julian, S.R.
- Carrington, A.
- Loram, J.W.
- Cooper, John Robert (7044)
Journal: Phys.Rev.B
Number: 14
ISSN: 0163-1829
Volume: 51
Year: 1995
Pages: from 9375 to 9378
Number of references: 22
Language: engleski
Summary: We report measurements of the magnetic-field dependence of
the superconducting transitions of a series of underdoped
YBa2(Cu0.97Zn0.03)3O7-d thin films with transition temperatures (Tc) of
9.4, 12.5, 23 and 56.5K. The resistive critical field shows strong positive
curvature all the way down to 0.006Tc, similar to that observed previously
for overdoped Tl2Ba2CuO(6+d) single crystals.
Keywords: high-temperature superconductors, magnetoresistance
- Type of paper
: Paper in journal
Title: Low-temperature increase of resistive critical fields in
certain superconductors: A simple fluctuation approach
- Authors:
- Cooper, John Robert (7044)
- Loram, J.W.
- Wade, J.M.
Journal: Phys.Rev.B
Number: 9
ISSN: 0163-1829
Volume: 51
Year: 1995
Pages: from 6179 to 6182
Number of references: 23
Language: engleski
Summary: The resistive critical fields of several types of
superconductor show an unusual increase at low temperatures. We argue that
this arises from thermodynamic fluctuations which are strongly enhanced
because of the reduction in condensation energy density U(H,T) by a
magnetic field. This effect should be significant for any material for
which UV(coh)
Keywords: high-temperature superconductors, organic superconductors
- Type of paper
: Paper in journal
Title: An investigation of the irreversibility line in
Bi2Sr2CaCu2O8 single crystals
- Authors:
- Supple, F.
- Campbell, A.M.
- Cooper, John Robert (7044)
Journal: Physica C
ISSN: 0921-4534
Volume: 242
Year: 1995
Pages: from 233 to 245
Number of references: 20
Language: engleski
Summary: Measurements of the irreversibility line for a BSCCO single
crystal have been made using resistivity, AC susceptibility (ACS), and DC
magnetisations.
Keywords: high-temperature superconductors, conductivity, magnetic properties
- Type of paper
: Paper in journal
Title: Comparison of carrier concentration determined by
structural and electrical studies of cation substituted YSr2Cu3O7-d
- Authors:
- de Silva, P.S.I.P.N.
- Babu, T.G.N.
- Greaves, C.
- Janossy, A.
- Cooper, John Robert (7044)
Journal: Physica C
ISSN: 0921-4534
Volume: 243
Year: 1995
Pages: from 252 to 256
Number of references: 23
Language: engleski
Summary: Results of resistivity, thermoelectric power and magnetic
susceptibility measurements are reported for Sr/Ba and Ca/Y substituted
YBa2Cu3O7 (YBCO) with various substitutions (Co,Cr or Ga) on the Cu(1)
chain site.
Keywords: high-temperature superconductors, conductivity, thermoelectric-power, magnetic properties
- Type of paper
: Paper in proceedings
Title: Electrical Transport in the Organic Superconductor
betha-(BEDT-TTF)2AuI2: Influence of X-Ray Induced Defects on the Normal
Phase and Superconducting Ground State
- Authors:
- Biškup, Neven (179286)
- Dolanski Babić, Sanja (188231)
- Tomić, Silvia (65594)
- Editors
- Stafstrom, S.
- Salaneck, W.R.
- Inganas, O.
- Hjertberg, T.
Proceedings title: Proceedings of the ICSM'92
Language: engleski
Place: Lausanne, Switzerland
Year: 1993
ISBN/ISSN: 0379-6779
Pages: from 2821 to 2826
Meeting: Proceedings of the International Conference on Science and Technology of Synthetic Metals,Goteborg
Held: from 08/12/92 to 08/18/92
Summary: We have measured the in-plane and out-of-plane resistivity
of theorganic superconductor betha-(BEDT-TTF)2AuI2 with disorderintroduced
by x-ray irradiation. For defect concentrations lessthan 0.15%/mole
Matthiessen's rule is obeyed. The long rangesuperconducting order is
destroyed by 0.1%/mole and thetransition is completely smeared out above
0.2%/mole of defects.Two-dimensional localization for the suppression
ofsuperconducting ground state is discussed.
- Type of paper
: Paper in proceedings
Title: Magnetic Field Influence on the Spin-Density Wave of the
Organic Conductor (TMTSF)2NO3
- Authors:
- Tomić, Silvia (65594)
- Biškup, Neven (179286)
- Korin-Hamzić, Bojana (61314)
- Basletić, Mario (197593)
- Hamzić, Amir (15234)
- Maki, K.
- Fabre, J.M.
- Bechgaard, K.
- Editors
- Brazovskii, S.
- Monceau, P.
Proceedings title: International Workshop on Electronic Crystals
Language: engleski
Place: Les Ulis, France
Year: 1993
ISBN/ISSN: 2-86883-197-4
Pages: from 293 to 298
Meeting: International Workshop on Electronic Crystals, ECRYS-93
Held: from 06/02/93 to 06/04/93
Summary: We present the influence of a transverse magnetic field on
thespin-density wave (SDW) ground state of the organic
conductor(TMTSF)2NO3. Magnetic field increases the
single-particleactivation energy. A finite magnetic field (Hc)
inducesdiscontinuities in the magnetoresistance behaviour and its valueis
temperature dependent. The threshold electric field (ET) forthe SDW sliding
increases in a magnetic field. All observedeffects are strongly
angle-dependent indicating that they aredetermined by the magnetic field
component along the leastconduction (c*) direction. We discuss these
results in theframework of a theoretical model for the SDW with large
imperfectnesting.
- Type of paper
: Paper in proceedings
Title: Magnetotransport Effects in the Spin-Density Wave State of
the Organic Conductor (TMTSF)2NO3
- Authors:
- Basletić, Mario (197593)
- Hamzić, Amir (15234)
- Biškup, Neven (179286)
- Tomić, Silvia (65594)
- Korin-Hamzić, Bojana (61314)
- Maki, K.
- Fabre, J.M.
- Bechgaard, K.
- Editors
- Brazovskii, S.
- Monceau, P.
Proceedings title: International Workshop on Electronic Crystals
Language: engleski
Place: Les Ulis, France
Year: 1993
ISBN/ISSN: 2-86883-197-4
Pages: from 315 to 318
Meeting: International Workshop on Electronic Crystals, ECRYS-93
Held: from 06/02/93 to 06/04/93
Summary: We report a study of the transverse magnetoresistance
propertiesin the spin-density wave (SDW) phase of teh organic
conductor(TMTSF)2NO3 at temperatures down to 1.8K and in magnetic field
upto 6tesla. The transverse magnetoresistance shows large effectand is
highly anisotropic. We analyze our data in the frameworkof recent
theoretical calculations by K.Maki. We suggest that theSDW with large
imperfect nesting together with a periodic anionpotential might be
responsible for the magnetic field effects.
- Type of paper
: Paper in proceedings
Title: 17O and 63Cu NMR Investigation of Spin Fluctuation in High
Tc Superconducting Oxides
- Authors:
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Horvatić, M. (112333)
- Kitaoka, Y.
- Segrensan, P
- Editors
- Reiter, G.
- Horsch, P.
- Psaltakis, G.
Proceedings title: Dynamics of Magnetic Fluctuations in High Temperature Superconductors
Language: engleski
Place: Kreta, Grčka
Year: 1991
Pages: from 73 to 85
Meeting: NATO Advanced Research Workshop
Held: from 10/01/89 to 10/04/89
- Type of paper
: Paper in proceedings
Title: Infrared Studies of High Tc Superconductors: where's the
Gap?
- Authors:
- Tanner, D.B.
- Romero, D.B.
- Kamaras, K.
- Carr, G.L.
- Forro, L. (114515)
- Mandrus, D.
- Mihaly, L.
- Williams, G.P.
- Editors
- Vezoli, G.
Proceedings title: Electronic Structure and Mechanisms for High Temperature Superconductivity
Language: engleski
Place: Miami, USA
Year: 1991
Pages: from 0 to 0
Meeting: Workshop on Electronic Structure and Mechanisms for High Temperature Superconductivity
- Type of paper
: Paper in proceedings
Title: 17O Nuclear Spin-Lattice Relaxation in YBa2Cu3O6+x Single
Crystals
- Authors:
- Horvatić, M. (112333)
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Segrensan, P
- Henry, J.Y.
- Editors
- Tachiki, M.
- Muto, Y.
- Syono, Y.
Proceedings title: Proceedings of the M2 HTSC-III Conference, Physica C
Language: engleski
Year: 1991
Pages: from 185 to 189
Meeting: International Conference on "Materials and Mechanisms of Superconductivity High Temperature Superconductors III"
- Type of paper
: Paper in proceedings
Title: NMR Investigation of Low-Energy Excitations in YBa2Cu3O6+x
Single Crystals
- Authors:
- Auler, T.
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
- Editors
- Muller, K.A.
- Benedek, G.
Proceedings title: Proceedings of the Workshop on "Phase Separation in Cuprate Superconductors
Language: engleski
Place: Singapore, Singapore
Year: 1993
ISBN/ISSN: 981-02-1274-7
Pages: from 224 to 231
Meeting: Phase Separation in Cuprate Superconductors
Held: from 05/06/92 to 05/12/92
- Type of paper
: Paper in proceedings
Title: A thermodynamic investigation of the normal state spectrum
of YBa2Cu3O6+x
- Authors:
- Loram, J.W.
- Mirza, K.A.
- Wade, J.M.
- Cooper, John Robert (7044)
- Athanassopoulou, N.
- Liang, W.
- Editors
- Yamafuji, K.
- Morishita, T.
Proceedings title: Procs. 7th International conference on superconductivity, ISS-94
Language: engleski
Place: Tokyo, Japan
Year: 1995
Pages: from 75 to 80
Meeting: 7th International conference on superconductivity, ISS-94
Summary: From a detailed comparison of the electronic specific heat
and magnetic susceptibility of YBa2Cu3O6-x we find broad numerical
agreement between the normal state electronic entropy and the product
between Wilson ratio times susceptibility times temperature over a wide
range of x and temperature. This demonstrates that charge and spin
excitations make a comparable contribution to the entropy and that the
normal state pseudo-gap develops in both spin and charge spectra.
Keywords: specific heat, magnetic susceptibility, high temperature superconductivity
- Type of paper
: Paper in proceedings
Title: Spin susceptibility of high Tc superconductors probed by
high field Gd3+ ESR
- Authors:
- Janossy, A.
- Brunel, L.-C.
- Williams, G.P.
- Cooper, John Robert (7044)
- Liang, W.
Proceedings title: Proceedings of Conference on Physical Phenomena at High Magnetic Fields-II
Language: engleski
Year: 1995
Meeting: Conference on Physical Phenomena at High Magnetic Fields-II
Held: from 05/06/95 to 05/09/95
Summary: The conduction electron spin susceptibility is determined
from Gd3+ ESR Knight shifts at 245GHz (H=8.8T) in Gd: YBa2Cu3Oy (6.0
Keywords: high temperature superconductivity, electron spin resonance, spin susceptibility, Knight shift
- Type of paper
: Summary in proceedings
Title: Low Energy Excitations in YBa2Cu3O6+x; a Comparison
between NMR and Neutron Inelastic Scattering
- Authors:
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
- Editors
- Brinkmann, D.
- Mali, M.
- Roos, J.
Proceedings title: Colloque Ampere on NMR/NQR in High-Tc Superconductors
Language: engleski
Place: Zurich, Switzerland
Year: 1991
Pages: from 0 to 0
Meeting: 10th Specialized Colloque Ampere on NMR/NQR in High-Tc Superconductors
Held: from 08/01/91 to 08/04/91
- Type of paper
: Summary in proceedings
Title: NMR Investigation of the Static and Dynamic Susceptibility
in YBa2Cu3O6+x
- Authors:
- Berthier, C.
- Berthier, Y.
- Butaud, P.
- Clark, W.G.
- Gillet, J.A.
- Horvatić, M. (112333)
- Segrensan, P
- Henry, J.Y.
Proceedings title: Transport and Excitations in Novel Superconductors
Language: engleski
Place: Torino, Italy
Year: 1991
Pages: from 0 to 0
Meeting: NATO Advanced Research Workshop on Transport and Excitations in Novel Superconductors
Held: from 10/01/91 to 10/04/91
- Type of paper
: Ph.D.
Title: Nuclear Magnetic Resonance Study of the High-Temperature
Superconductor YBa2Cu3O7-y
Faculty: Prirodoslovno-matematički Zagreb
Author: HORVATIĆ MLADEN
Date of defense: 05/09/91
Language: engleski
Number of pages: 134
- Type of paper
: Mentorship
Title: Influence of disorder on the electrical conductivity and
the ground state of organic conductors
Faculty: Prirodoslovno-matematički Zagreb
Mentor: TOMIĆ SILVIA
Date of defense: 07/01/91
Number of pages: 70
Author: Dolanski Babić dipl.ing Sanja
Degree level: D.A.
- Type of paper
: Mentorship
Title: Magnetoresistance of the anisotropic organic conductor
(TMTSF)2NO3
Faculty: Prirodoslovno-matematički Zagreb
Mentor: TOMIĆ SILVIA
Date of defense: 07/01/92
Author: Basletić dipl. inž. Mario
Degree level: D.A.
- Type of paper
: Mentorship
Title: Dielectric response of spin density waves
Faculty: Prirodoslovno-matematički Zagreb
Mentor: TOMIĆ SILVIA
Date of defense: 06/01/94
Number of pages: 47
Author: Omerzu dipl.ing Aleš
Degree level: D.A.
- Type of paper
: Invited lecture
Title: Organic conductors: physics of reduced dimensionality
Institution: Odense University
Year: 1991
- Type of paper
: Invited lecture
Title:
Institution: Universite J.Fourier
Year: 1992
- Type of paper
: Invited lecture
Title: Magnetic field influence on the low and high electric
field transport in the spin density wave state of the organic conductor
(TMTSF)2NO3
Institution: Universite Paris-Sud
Year: 1992
- Type of paper
: Invited lecture
Title: Magnetic field influence on the low and high electric
field transport in the spin density wave state of the organic conductor
(TMTSF)2NO3
Institution: CNRS-Grenoble
Year: 1992
- Type of paper
: Invited lecture
Title: A simple physical picture for the thermoelectric power and
Hall effect of high-Tc oxydes
Institution: University of Cambridge
Year: 1992
- Type of paper
: Invited lecture
Title: A simple physical picture for the thermoelectric power and
Hall effect of high-Tc oxydes
Institution: Electrotechnical Laboratory
Year: 1992
- Type of paper
: Invited lecture
Title: NMR in YBa2Cu3O6+x single crystals
Institution: SNCI-CNRS
Year: 1992
- Type of paper
: Invited lecture
Title: SDW dynamics in organic conductors
Institution: Gakushuin University
Year: 1994
- Type of paper
: Other
Title: Influence of disorder on non-linear conductivity in SDW
states of Bechgaard salts
- Authors:
- Tomić, Silvia (65594)
Type of work: pozvano predavanje na Gordon konferenciji, Irsee, 1991.
Language: engleski
- Type of paper
: Other
Title: Quantum Hall effect and FISDW states in (TMTSF)2PF5 and
ReO4
- Authors:
- Cooper, John Robert (7044)
Type of work: pozvano predavanje na Gordon konferenciji, Irsee, 1991.
Language: engleski
- Type of paper
: Other
Title: Physical properties of novel organic alloys
((TMTSF)x(TMTTF)1-x)2ReO4
- Authors:
- Tomić, Silvia (65594)
Type of work: pozvano predavanje na Gordon koferenciji, Il Ciocco, 1993.
Language: engleski
- Type of paper
: Other
Title: NMR investigation of low energy excitations in high-Tc
superconductors
- Authors:
- Horvatić, M. (112333)
Type of work: pozvano predavanje na Russian-French seminar, Gatchina, 1993
Language: engleski
- Type of paper
: Other
Title: Low frequency dielectric response of commensurate and
incommensurate spin-density waves
- Authors:
- Tomić, Silvia (65594)
Type of work: pozvano predavanje na medjunarodnom skupu, University of Tokyo, Tokyo, 1994.
Language: engleski
- Type of paper
: Other
Title: Complex low-frequency dielectric response of the
spin-density wave phase in the Bechgaard salt (TMTSF)2PF6
- Authors:
- Tomić, Silvia (65594)
Type of work: pozvano predavanje na medjunarodnom skupu, Mittelberg, 1995.
Language: engleski
