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.
@article{arxiv.0905.0964,
title = {Correlation between linear resistivity and Tc in organic and pnictide superconductors},
author = {Nicolas Doiron-Leyraud and P. Auban-Senzier and S. Rene de Cotret and A. Sedeki and C. Bourbonnais and D. Jerome and K. Bechgaard and Louis Taillefer},
journal= {arXiv preprint arXiv:0905.0964},
year = {2009}
}