Correlation between linear resistivity and Tc in organic and pnictide superconductors

Details Correlation between linear resistivity and Tc in organic and pnictide superconductors Correlation between linear resistivity and Tc in organic and pnictide superconductors

2009-05-07

arxiv.org/abs/0905.0964v1

Physics

Condensed Matter

Superconductivity

Scientific paper

A linear temperature dependence of the electrical resistivity as T -> 0 is the hallmark of quantum criticality in heavy-fermion metals and the archetypal normal-state property of high-Tc superconductors, yet in both cases it remains unexplained. We report a linear resistivity on the border of spin-density-wave order in the organic superconductor (TMTSF)2X (X = PF6, ClO4), whose strength scales with the superconducting temperature Tc. This scaling, also present in the pnictide superconductors, reveals an intimate connection between linear-T scattering and pairing, shown by renormalization group theory to arise from antiferromagnetic fluctuations, enhanced by the interference of superconducting correlations. Our results suggest that linear resistivity in general may be a consequence of such interference and pairing in overdoped high-Tc cuprates is driven by antiferromagnetic fluctuations, as in organic and pnictide superconductors.

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