Correlation between linear resistivity and Tc in the Bechgaard salts and the pnictide superconductor Ba(Fe1xCox)2As2

Nicolas Doiron-Leyraud, Pascale Auban-Senzier, Samuel René de Cotret, Claude Bourbonnais, Denis Jérome, Klaus Bechgaard, and Louis Taillefer
Phys. Rev. B 80, 214531 – Published 28 December 2009

Abstract

The quasi-one-dimensional organic Bechgaard salt (TMTSF)2PF6 displays spin-density-wave (SDW) order and superconductivity in close proximity in the temperature-pressure phase diagram. We have measured its normal-state electrical resistivity ρa(T) as a function of temperature and pressure, in the T0 limit. At the critical pressure where SDW order disappears, ρa(T)T down to the lowest measured temperature (0.1 K). With increasing pressure, ρa(T) acquires a curvature that is well described by ρa(T)=ρ0+AT+BT2, where the strength of the linear term, measured by the A coefficient, is found to scale with the superconducting transition temperature Tc. This correlation between A and Tc strongly suggests that scattering and pairing in (TMTSF)2PF6 have a common origin, most likely rooted in the antiferromagnetic spin fluctuations associated with SDW order. Analysis of published resistivity data on the iron-pnictide superconductor Ba(Fe1xCox)2As2 reveals a detailed similarity with (TMTSF)2PF6, suggesting that antiferromagnetic fluctuations play a similar role in the pnictides.

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  • Received 19 August 2009

DOI:https://doi.org/10.1103/PhysRevB.80.214531

©2009 American Physical Society

Authors & Affiliations

Nicolas Doiron-Leyraud1,*, Pascale Auban-Senzier2, Samuel René de Cotret1, Claude Bourbonnais1,3, Denis Jérome2,3, Klaus Bechgaard4, and Louis Taillefer1,3,†

  • 1Département de Physique and RQMP, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
  • 2Laboratoire de Physique des Solides, UMR 8502 CNRS, Université Paris-Sud, 91405 Orsay, France
  • 3Canadian Institute for Advanced Research, Toronto, Canada
  • 4Department of Chemistry, H.C. Ørsted Institute, Copenhagen, Denmark

  • *ndl@physique.usherbrooke.ca
  • louis.taillefer@usherbrooke.ca

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Vol. 80, Iss. 21 — 1 December 2009

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