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

Authors
Dressel, M.
Petukhov, K.
Salameh, B.
Zornoza, P.
Published in Physical Review. B, Condensed Matter. 2005, vol. 71, no. 7
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 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 200K. Even along the least conducting c∗ direction no region with semiconducting behavior is revealed up to room temperature.
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DRESSEL, M. et al. Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors. In: Physical Review. B, Condensed Matter, 2005, vol. 71, n° 7. https://archive-ouverte.unige.ch/unige:36132

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Deposited on : 2014-04-29

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