PL EN


Preferences help
enabled [disable] Abstract
Number of results
1995 | 87 | 4-5 | 749-759
Article title

Investigations of Fermi Surfaces and Effective Masses of the Organic Superconductors (BEDO-TTF)_{2}ReO_{4}(H_{2}O) and κ-(BEDT-TTF)_{2}I_{3} by Shubnikov-de Haas and de Haas-van Alphen Measurements

Content
Title variants
Languages of publication
EN
Abstracts
EN
The Fermi surfaces and effective masses of (BEDO-TTF)_{2}ReO_{4}(H_{2}0) and κ-(BEDT-TTF)_{2}I_{3} were investigated by Shubnikov–de Haas (SdH) and de Haas–van Alphen (dHvA) measurements in magnetic fields up to 27 T in the temperature range from 0.5 K to 4.2 K. Two small closed pockets (0.7% and 1.5% of the first Brillouin zone) are observed in (BEDO-TTF)_{2}ReO_{4}(H_{2}0) corresponding very well with two cross-sectional areas of the Fermi surfaces obtained for a hole and an electron pocket from tight binding calculations. In contrast, in κ-(BEDT-TTF)_{2}I_{3} two rel­atively large closed sections (13% and 85% of the first Brillouin zone) of the Fermi surfaces are observed, again confirming the tight binding calcu­lations. For κ-(BEDT-TTF)_{2}I_{3} in magnetic fields above 12 T the effective mass for the larger orbit, as obtained from the temperature dependence of the SdH-oscillation amplitudes, is magnetic field dependent as long as the field is arranged perpendicular to the conducting planes (Θ = 0°). In con­trast, from dHvA measurements - which were performed by turning the magnetic field by 27° with respect to the SdH experiments - the observed effective mass is field independent. We suppose that the occurrence of anyons at temperatures below 1 K and in fields above 12 T might be the reason for the observed field dependence of the effective mass in the SdH investigations under the special angle 0°.
Keywords
EN
Publisher

Year
Volume
87
Issue
4-5
Pages
749-759
Physical description
Dates
published
1995-04
Contributors
author
  • 3. Physik. Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
author
  • 3. Physik. Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
author
  • 3. Physik. Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
author
  • Anorg.-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
author
  • Anorg.-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
author
  • Anorg.-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
author
  • Walther Meissner Institut, Walther-Meissner-Str. 8, 85748 Garching, Germany
author
  • High Magnetic Field Laboratory, MPI für Festkörperforschung, 38042 Grenoble Cedex 9, France
author
  • High Magnetic Field Laboratory, MPI für Festkörperforschung, 38042 Grenoble Cedex 9, France
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv87z407kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.