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Title: Quasi-two-dimensional spin-split Fermi-liquid behavior of {kappa}-(BEDT-TTF){sub 2}I{sub 3} in strong magnetic fields

Abstract

Measurements of both the magnetization and magnetotransport of {kappa}-(BEDT-TTF){sub 2}I{sub 3} (BEDT-TTF is bisethylenedithio-tetrathiafulvalene) in magnetic fields extending to 60 T at 0.4 K and 20 T at 35 mK are reported. Strong eddy currents observed in the magnetization are found to exhibit critical currentlike behavior. This might be connected with the breakdown of the quantum Hall effect, as proposed previously for {alpha}-phase salts. The strong two dimensionality leads to an apparent fall of the effective mass together with an overall suppression of the amplitude of the magnetic quantum oscillations at high magnetic fields or very low temperatures. These effects are more pronounced for the Shubnikov{endash}de Haas (SdH) effect but clearly visible also for the de Haas{endash}van Alphen (dHvA) oscillations. The apparent fall of the effective mass and the deviations of the dHvA signal from the behavior predicted by the standard Lifshitz-Kosevich theory can quantitatively be explained by the influence of chemical-potential oscillations on the wave form in a two-dimensional, spin-split Fermi liquid. The much stronger deviations from the conventional behavior in the transport data hint to an additional mechanism unique to the SdH effect. thinsp {copyright} {ital 1998} {ital The American Physical Society}

Authors:
; ;  [1];  [2]; ;  [3]; ;  [4]; ;  [5]
  1. National High Magnetic Field Laboratory, LANL, Los Alamos, New Mexico, 87545 (United States)
  2. Physikalisches Institut, Universitaet Karlsruhe, D-76128, Karlsruhe (Germany)
  3. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32306 (United States)
  4. 3. Physikalisches Institut, Universitaet Stuttgart, D-70550, Stuttgart (Germany)
  5. Anorganisch-Chemisches Institut, Universitaet Heidelberg, D-69120, Heidelberg (Germany)
Publication Date:
OSTI Identifier:
298606
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 58; Journal Issue: 16; Other Information: PBD: Oct 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; EDDY CURRENTS; ORGANIC SUPERCONDUCTORS; MAGNETIZATION; CHARGED-PARTICLE TRANSPORT; SHUBNIKOV-DE HAAS EFFECT; MAGNETORESISTANCE; HALL EFFECT; MAGNETIC FIELDS; EFFECTIVE MASS; OSCILLATIONS; ORGANIC COMPOUNDS; FERMI LEVEL

Citation Formats

Harrison, N, Mielke, C H, Rickel, D G, Wosnitza, J, Qualls, J S, Brooks, J S, Balthes, E, Schweitzer, D, Heinen, I, and Strunz, W. Quasi-two-dimensional spin-split Fermi-liquid behavior of {kappa}-(BEDT-TTF){sub 2}I{sub 3} in strong magnetic fields. United States: N. p., 1998. Web. doi:10.1103/PhysRevB.58.10248.
Harrison, N, Mielke, C H, Rickel, D G, Wosnitza, J, Qualls, J S, Brooks, J S, Balthes, E, Schweitzer, D, Heinen, I, & Strunz, W. Quasi-two-dimensional spin-split Fermi-liquid behavior of {kappa}-(BEDT-TTF){sub 2}I{sub 3} in strong magnetic fields. United States. https://doi.org/10.1103/PhysRevB.58.10248
Harrison, N, Mielke, C H, Rickel, D G, Wosnitza, J, Qualls, J S, Brooks, J S, Balthes, E, Schweitzer, D, Heinen, I, and Strunz, W. Thu . "Quasi-two-dimensional spin-split Fermi-liquid behavior of {kappa}-(BEDT-TTF){sub 2}I{sub 3} in strong magnetic fields". United States. https://doi.org/10.1103/PhysRevB.58.10248.
@article{osti_298606,
title = {Quasi-two-dimensional spin-split Fermi-liquid behavior of {kappa}-(BEDT-TTF){sub 2}I{sub 3} in strong magnetic fields},
author = {Harrison, N and Mielke, C H and Rickel, D G and Wosnitza, J and Qualls, J S and Brooks, J S and Balthes, E and Schweitzer, D and Heinen, I and Strunz, W},
abstractNote = {Measurements of both the magnetization and magnetotransport of {kappa}-(BEDT-TTF){sub 2}I{sub 3} (BEDT-TTF is bisethylenedithio-tetrathiafulvalene) in magnetic fields extending to 60 T at 0.4 K and 20 T at 35 mK are reported. Strong eddy currents observed in the magnetization are found to exhibit critical currentlike behavior. This might be connected with the breakdown of the quantum Hall effect, as proposed previously for {alpha}-phase salts. The strong two dimensionality leads to an apparent fall of the effective mass together with an overall suppression of the amplitude of the magnetic quantum oscillations at high magnetic fields or very low temperatures. These effects are more pronounced for the Shubnikov{endash}de Haas (SdH) effect but clearly visible also for the de Haas{endash}van Alphen (dHvA) oscillations. The apparent fall of the effective mass and the deviations of the dHvA signal from the behavior predicted by the standard Lifshitz-Kosevich theory can quantitatively be explained by the influence of chemical-potential oscillations on the wave form in a two-dimensional, spin-split Fermi liquid. The much stronger deviations from the conventional behavior in the transport data hint to an additional mechanism unique to the SdH effect. thinsp {copyright} {ital 1998} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.58.10248},
url = {https://www.osti.gov/biblio/298606}, journal = {Physical Review, B: Condensed Matter},
number = 16,
volume = 58,
place = {United States},
year = {1998},
month = {10}
}