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Hall effect and conduction anisotropy in the organic conductor (TMTSF)2PF6
Mihaly1, Kezsmarki, Zamborszky
1IGA, Ecole Politechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland and Department of Physics, Technical University of Budapest, H-1111 Budapest, Hungary.
The Hall effect and conductivity anisotropy in Bechgaard salts (TMTSF)2PF6 do not show expected changes with reduced carrier density. Findings support Fermi liquid theory for normal phase properties, with Luttinger liquid behavior above room temperature.
Area of Science:
- Condensed matter physics
- Materials science
- Solid-state physics
Background:
- Investigating the unconventional normal phase properties of Bechgaard salts, specifically (TMTSF)2PF6.
- Understanding the interplay between Hall effect, conduction anisotropy, and carrier density in these materials.
Purpose of the Study:
- To analyze the normal phase properties of (TMTSF)2PF6 using Hall effect and ab-plane conduction anisotropy.
- To reconcile optical data on carrier density reduction with transport measurements.
- To determine the validity of Fermi liquid theory and explore potential Luttinger liquid behavior.
Main Methods:
- Measurement of Hall effect in (TMTSF)2PF6.
- Analysis of ab-plane conduction anisotropy.
- Investigation of pressure and temperature dependence of b-direction resistivity.
Main Results:
- Hall resistance did not significantly increase despite a dramatic reduction in carrier density observed in optical data.
- The b-direction resistivity exhibited pressure and temperature dependence consistent with an isotropic relaxation time.
- Results align with predictions from Fermi liquid theory, indicating no need for exotic explanations.
Conclusions:
- The normal phase of (TMTSF)2PF6 is well-described by Fermi liquid theory.
- A coherent-diffusive transition governs interchain carrier propagation.
- A crossover to Luttinger liquid behavior is possible but occurs at temperatures above room temperature.
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