SVIBOR - Project code: 1-03-055

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Project code: 1-03-055


Modulated Low-Dimensional Inorganic Systems


Main researcher: BILJAKOVIĆ, KATICA (76732)


Assistants
Type of research: basic
Duration from: 01/01/91. to 12/31/94.
Papers on project (total): 33
Papers on project quoted in Current Contents: 8
Institution name: Institut za fiziku, Zagreb (35)
Department/Institute: Physics of metals II
Address: Bijenička 46
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (1) 271 211
E-mail: biljak%olimp.irb.hr
E-mail: katica%ifs.hr
Fax: 385 (1) 421 156
Summary: Our Project deals with the physical properties of the modulated low-dimensional solids exhibiting density-waves (DW) as charge and/or spin-density-waves (CDW/SDW).The DW system provides a very fruitful model of studying the effects of the reduced dimensionality on competing time-energy scales. This has been stated in the Report of American National Research Council (National Academy Press, 1986) as one of the most propulsive field in Solid State Physics in the last decade. In order to get a deeper knowledge of the microscopic grounds of the basic phenomena specific for the CDW/SDW ground state, we have undertaken a detailed investigation of the thermal, electrical and acoustic transport in a very large temperature range on numerous quasi-one-dimensional conductors and semiconductors. The most significant results we have obtained reveal the additional contribution to the thermal conductivity originating from CDW excitations at higher temperatures (around the CDW phase transition), the anomalous behaviour of the thermal conduction at very low temperatures caused by the specific phonon spectrum as well as the existence of specific glassy characteristics of DW including also the real glass transition. We emphesize that all these results point towards a very rich and complex physical behaviour, and are suggestive of new methods and consepts in understanding the physics of the low dimensional solids.

Keywords: phase transition, order-disorder, glass, reduced dimensionality, relaxation phenomena, charge/spin density waves, thermal properties, heat capacity, heat transport, thermoelectric effects

Research goals: Our experimental program is the part of a wider project established through one EC project and few bilateral programs. It has been a concequence of a strong need to concentrate efforts for a more systematic aproach to the basic investigation of the intrinsic features of DW systems in order to obtain a proper microscopic description of the Peierls conductors. The research has been carried on in cooperation with laboratories in France, Germany, Japan and Russia. The same, high quality single crystals obtained from the world established experts in the crystal synthesis (Lausanne, Copenhagen and Sapporo) have been investigated by different complementary techniques in order to characterize better the critical phenomena related to the Peierls transition as well as the low temperature ground state properties. Our specific contribution is the systematic investigation and analysis of the thermal transport and thermoelectric effects in these systems as the question of heat transport by CDW is almost untouched in this research field. One of the greatest prioritiesis the clarification of the nature of the DW glass. It was the motivation for introducing a new technology for the investigation of the low frequency dielectric response. Our intention is to make connection between disordered DW ground state and other disordered media such as spin glasses, structural glasses, polymers. It is a new and very promissing line of research.

COOPERATION - PROJECTS


  1. Name of project: CI 1-0526-M(CD) Thermodinamical and Optical Properties of Inorganic Quasi-One-Dimensional Conductors Exhibiting Charge Density Wave Transport
    Name of institution: Centre de Recherches sur les Tres Basses Temperatures,CNRS
    City: 38 000 - Grenoble, Francuska

  2. Name of project: CI1-0526-M(CD) Thermodynamical and optical properties of inorganic quasi one-dimensional conductors exhibiting charge-density-wave transport
    Name of institution: Institut fur Angewandte Physik, Universitat Karlsruhe
    City: 7500 - Karlsruhe, Njemačka

  3. Name of project: bilaterala Etude des Excitations de Basse Energie des Systems Incommensurables
    Name of institution: Centre de Recherches sur les Tres Basses Temperatures, CNRS
    City: 38 000 - Grenoble, Francuska

  4. Name of project: bilaterala Ispitivanje transporta u sistemima s valovima gustoće naboja
    Name of institution: Institute za radioinženjerstvo i elektroniku Ruske akademije znanosti
    City: 103 907 - Moskva, Rusija

  5. Name of project: bilaterala Transportna svojstva u niskodimenzionalnim sistemima
    Name of institution: Institute of Atomic Physics, Department of Theoretical Physics
    City: 7600 - Bukurešt, Rumunjska

  6. Name of project: B/CI1*-913183 Investigation of Structural Properties and Phase Transition in Anysotropic Systems with Incommensurately Modulated Structures
    Name of institution: Department of Chemistry
    City: 9747 - Groningen, Nizozemska

COOPERATION - INSTITUTIONS


  1. Name of institution: Centre de Recherche sur les Tres Basses Temperatures,CNRS
    Type of institution: State institute
    Type of cooperation: Joint project
    City: 38 000 - Grenoble, Francuska

  2. Name of institution: Institut fur Angewandte Physik, Universitat Karlsruhe
    Type of institution: University/Faculty
    Type of cooperation: Joint project
    City: 7500 - Karlsruhe, Njemačka

  3. Name of institution: Institute of Radioengineering and Electronics
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 103 907 - Moskva, Rusija

  4. Name of institution: Service de Physique de l'Etat Condense, Commissariat a l'Energie Atomique
    Type of institution: State institute
    Type of cooperation: Systematic exchange of information
    City: 91191 - Giff sur Yvette, Francuska

  5. Name of institution: Ecole Polytechnique Federale de Lausanne
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 1015 - Lausanne, Švicarska

  6. Name of institution: Department of Physics, Faculty of Science, Hokkaido University
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 060 - Sapporo, Japan

  7. Name of institution: Institute of Atomic Physics, Department of Theoretical Physics
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: 7600 - Bukurešt, Rumunjska

  8. Name of institution: Department of Chemistry, University of Groningen
    Type of institution: University/Faculty
    Type of cooperation: Joint project
    City: 9747 - Groningen, Nizozemska

  9. Name of institution: Applied Physics Laboratory, Tokyo University M. Marine
    Type of institution: University/Faculty
    Type of cooperation: Systematic exchange of information
    City: Tokyo, Japan

  10. Name of institution: National Institute of Materials and Chemical Research
    Type of institution: State institute
    Type of cooperation: Joint publishing of scientific papers
    City: Tsukuba, Japan

OTHER ACHIEVEMENTS


  1. Name: Sistem za temperaturnu stabilizaciju visoke točnosti
    Type of achievement: Technology
    Authors: Ž. Bihar, K. Biljaković, D. Rodinis, A. Smontara

  2. Name: Uređaj za precizno mjerenje toplinske vodljivosti
    Type of achievement: Technology
    Authors: Ž. Bihar, K. Biljaković, A. Smontara

  3. Name: Uređaj za precizno mjerenje termostruje
    Type of achievement: Technology
    Authors: Ž. Bihar, K. Biljaković, D. Rodinis, A. Smontara

  4. Name: Uređaj za precizno mjerenje električnog otpora
    Type of achievement: Technology
    Authors: Ž. Bihar, K. Biljaković, D. Rodinis, A. Smontara

  5. Name: Automatska punilica za tekući dušik
    Type of achievement: Prototypes
    Authors: Ž. Bihar, K. Biljaković, M.Vukelić

  6. Name: Uređaj za mjerenje toplinski potaknutog izbijanja
    Type of achievement: Technology
    Authors: D. Starešinić, K. Biljaković, S. Zaitsev-Zotov

  7. Name: Uređaj za mjerenje veoma malih struja
    Type of achievement: Technology
    Authors: D. Starešinić, K. Biljaković, M. Vukelić
Other information about the project.
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