Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 31: Correlated Electrons - Low-dimensional Materials I
TT 31.1: Vortrag
Dienstag, 8. März 2005, 14:00–14:15, TU H2053
Scaling Behavior of the Longitudinal and Transverse Transport in Quasi One-Dimensional Organic Conductors — •Martin Dressel1, Konstantin Petukhov1, Belal Salameh1, Pedro Zornoza1, and Thierry Giamarchi2 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2DPMC, University of Geneva, Switzerland
The organic conductors (TMTSF)2PF6 and (TMTSF)2ClO4 are model systems to study the Luttinger-liquid behavior in one dimension. We have investigated the dc and microwave transport properties along the a, b′, and c* directions. In the normal state of (TMTSF)2PF6 below T=70 K, the dc resistivity follows a power-law with ρa and ρb′ proportional to T2 while ρc*∝ T. Above T = 100 K 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 100 K. The b′ axis shows anomalous exponents that could be attributed to a large crossover between these two regimes. The organic superconductor (TMTSF)2ClO4 is more a two-dimensional metal with an anisotropy ρa/ρb′ 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 200 K. Even along the least conducting c* direction no region with semiconducting behavior is revealed up to room temperatu