Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors

M. Dressel, K. Petukhov, B. Salameh, P. Zornoza, and T. Giamarchi
Phys. Rev. B 71, 075104 – Published 4 February 2005

Abstract

We report on dc and microwave experiments of the low-dimensional organic conductors (TMTSF)2PF6 and (TMTSF)2ClO4 along the a, b, and c* directions. In the normal state of (TMTSF)2PF6 below T=70K, the dc resistivity follows a power law with ρa and ρb proportional to T2 while ρc*T. Above T=100K the exponents extracted from the data for the a and c* axes are consistent with what is to be expected for a system of coupled one-dimensional chains (Luttinger liquid) and a dimensional crossover at a temperature of about 100K. The b axis shows anomalous exponents that could be attributed to a large crossover between these two regimes. The contactless microwave measurements of single crystals along the b axis reveal an anomaly between 25 and 55K which is not understood yet. The organic superconductor (TMTSF)2ClO4 is more a two-dimensional metal with an anisotropy ρaρb of approximately 2 at all temperatures. Such a low anisotropy is unexpected in view of the transfer integrals. Slight indications to one-dimensionality are found in the temperature dependent transport only above 200K. Even along the least conducting c* direction no region with semiconducting behavior is revealed up to room temperature.

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  • Received 13 September 2004

DOI:https://doi.org/10.1103/PhysRevB.71.075104

©2005 American Physical Society

Authors & Affiliations

M. Dressel, K. Petukhov, B. Salameh, and P. Zornoza

  • 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany

T. Giamarchi

  • DPMC, University of Geneva, 24 quai Ernest-Ansermet, CH-1211 Geneva, Switzerland

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Issue

Vol. 71, Iss. 7 — 15 February 2005

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