Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-10
Physica B: Condensed Matter, Volume 405, Issue 11, Supplement 1, 2010, S265-S268
Physics
Condensed Matter
Superconductivity
ISCOM'09 proceedings to be published in Physica B
Scientific paper
10.1016/j.physb.2009.11.021
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.
Auban-Senzier Pascale
Bechgaard Klaus
de Cotret Rene S.
Doiron-Leyraud Nicolas
Jerome Denis
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