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arXiv · 0912.2049

Towards a consistent picture for quasi-1D organic superconductors

N. Doiron-Leyraud·P. Auban-Senzier·S. Rene de Cotret·K. Bechgaard·D Jerome·L. Taillefer
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Abstract

The electrical resistivity of the quasi-1D organic superconductor (TMTSF)2PF6 was recently measured at low temperature from the critical pressure needed to suppress the spin-density-wave state up to a pressure where superconductivity has almost disappeared. This data revealed a direct correlation between the onset of superconductivity at Tc and the strength of a non-Fermi-liquid linear term in the normal-state resistivity, going as r(T) = r0 + AT + BT2 at low temperature, so that A goes to 0 as Tc goes to 0. Here we show that the contribution of low-frequency antiferromagnetic fluctuations to the spin-lattice relaxation rate is also correlated with this non-Fermi-liquid term AT in the resistivity. These correlations suggest that anomalous scattering and pairing have a common origin, both rooted in the low-frequency antiferromagnetic fluctuations measured by NMR. A similar situation may also prevail in the recently-discovered iron-pnictide superconductors.

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N. Doiron-Leyraud, P. Auban-Senzier, S. Rene de Cotret, K. Bechgaard, D Jerome, L. Taillefer. 2009-12-10. Towards a consistent picture for quasi-1D organic superconductors. https://doi.org/10.1016/j.physb.2009.11.021

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