SVIBOR - Project code: 1-03-104

MINISTRY OF SCIENCE AND TECHNOLOGY

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Project code: 1-03-104


Electronic properties of strongly corelated electrons


Main researcher: ZLATIĆ, VELJKO (54915)


Assistants
Type of research: basic
Duration from: 01/01/91. to 01/01/96.
Papers on project (total): 23
Papers on project quoted in Current Contents: 17
Institution name: Institut za fiziku, Zagreb (35)
Department/Institute: Institute of Physics of the University
Address: Bijenička cesta 46, POB 304
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0) 271 211
Fax: 385 (0) 421 156
E-mail: Zlatic@olimp.irb.hr
E-mail: Miljak@olimp.irb.hr
Summary: The project was concerned with building up an understanding of the behaviour of strongly correlated electrons in systems such as heavy fermions, Kondo alloys, valence fluctuations, copper oxides, etc. Strong correlation is manifest in anomalous electronic thermodynamic and transport properties, magnetic behaviour, metal-insulator transitions and in high-temperature superconductivity. We studied these anomalies by theoretical and experimental methods. The experimental facilities in our group were greatly improved by acquiring the new superconducting split-coil magnet.

Keywords: strongly correlated electrons, heavy fermions, Kondo alloys, valence fluctuations, copper oxides, thermodynamic and transport properties, magnetic behaviour, metal-insulator transitions high temperature superconductivity

Research goals: Our main objective was careful acquisition and analysis of data obtained on well-defined metallic samples that show the effects of on-site correlations. We studied the onset of coherence as one moves from the single-impurity Kondo effect to a periodic array of locally correlated electrons and the changes in the correlated state induced by the the changes in the environment of Kondo ions. Our objective was a critical examination of existing theoretical models and the available solutions, and the assessment of their relevance for the understanding of the data. We were also interested in the influence of the final-state effects on the position and shape of the spectral lines in heavy fermions and copper oxides as these effects might be important for deducing the model parameters from the spectroscopic data.

COOPERATION - PROJECTS


  1. Name of project: 2274 Investigations of the physical properties of oxide superconductors
    Name of institution: Physicalisches Institut,JW Goethe University, 6000 Frankfurt/M, Robert-Mayer Str. 2-4
    City: Frankfurt/M, Germany

  2. Name of project: CI1*-0576 Magnetic properties and transport properties of Heavy Fermion Intermetallic Compounds
    Name of institution: Commision of the European Communities, Directorate-General foe Science, Research and Development, Joint research centre
    City: Brussels, Belgija

  3. Name of project: JF(NSF) 002 Electronic properties of high temperature superconductors
    Name of institution: National Science Foundation
    City: Princeton, USA

OTHER ACHIEVEMENTS


  1. Name: Razvijen je i potpuno kompjuterizirani ultra osjetljivi torzioni magnetometar za mjerenje anizotropije susceptibilnosti. Postojeća aparatura za mjerenje magnetske susceptibilnosti je kompjuterizirana.
    Type of achievement: Instrumentation
    Authors: M Miljak, I Kos, I Aviani

  2. Name: Supravodljivi magnet sa horizontalnim magnetskim poljem (jakosti 6 T) za mjerenja magnetske anizotropije i magnetotransporta sada je u fazi testiranja
    Type of achievement: Instrumentation
    Authors: M Miljak, I Kos
Other information about the project.
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