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

TY - JOUR

T1 - The metallic transport of (TMTSF)2X organic conductors close to the superconducting phase

AU - Auban-Senzier, P.

AU - Jérome, D.

AU - Doiron-Leyraud, N.

AU - de Cotret, S. René

AU - Sedeki, A.

AU - Bourbonnais, C.

AU - Taillefer, L.

AU - Alemany, P.

AU - Canadell, E.

AU - Bechgaard, Klaus

PY - 2011/8/31

Y1 - 2011/8/31

N2 - 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.

AB - 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.

M3 - Journal article

SN - 0953-8984

VL - 23

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

ER -