The metallic transport of (TMTSF)<inf>2</inf>X organic conductors close to the superconducting phase

P. Auban-Senzier, D. Jérome, N. Doiron-Leyraud, S. René De Cotret, A. Sedeki, C. Bourbonnais, L. Taillefer, P. Alemany, E. Canadell, K. Bechgaard

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    11 Citations (Scopus)

    Abstract

    Comparing resistivity data of the quasi-one-dimensional superconductors (TMTSF)2PF6 and (TMTSF)2ClO4along the least conducting c-axis and along the high conductivity a-axis as a function of temperature and pressure, a low temperature regime is observed in which a unique scattering time governs the transport along both directions of these anisotropic conductors. However, the pressure dependence of the anisotropy implies a large pressure dependence of the interlayer coupling. This is in agreement with the results of first-principles density functional theory calculations implying methyl group hyperconjugation in the TMTSF molecule. In this low temperature regime, both materials exhibit for c a temperature dependence aT+bT2. Taking into account the strong pressure dependence of the anisotropy, the T-linear c is found to correlate with the suppression of the superconducting Tc, in close analogy with a data. This work reveals the domain of existence of the three-dimensional coherent regime in the generic (TMTSF)2X phase diagram and provides further support for the correlation between T-linear resistivity and superconductivity in non-conventional superconductors. © 2011 IOP Publishing Ltd.
    Original languageEnglish
    Article number345702
    JournalJournal of Physics Condensed Matter
    Volume23
    Issue number34
    DOIs
    Publication statusPublished - 31 Aug 2011

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