Correlation between linear resistivity and $T_c$ in the Bechgaard salts and the pnictide superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$

Nicolas Doiron-Leyraud; Pascale Auban-Senzier; Samuel René de Cotret; Claude Bourbonnais; Denis Jérome; Klaus Bechgaard; Louis Taillefer

doi:10.1103/PhysRevB.80.214531

paper

Correlation between linear resistivity and $T_{c}$ in the Bechgaard salts and the pnictide superconductor Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

arXiv:0912.0559 · doi:10.1103/PhysRevB.80.214531

Abstract

The quasi-1D organic Bechgaard salt (TMTSF) $_{2}$ PF $_{6}$ 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 $ρ_{a} (T)$ as a function of temperature and pressure, in the $T \to 0$ limit. At the critical pressure where SDW order disappears, $ρ_{a} (T) \propto T$ down to the lowest measured temperature (0.1 K). With increasing pressure, $ρ_{a} (T)$ acquires a curvature that is well described by $ρ_{a} (T) = ρ_{0} + A T + B T^{2}$ , where the strength of the linear term, measured by the $A$ coefficient, is found to scale with the superconducting transition temperature $T_{c}$ . This correlation between $A$ and $T_{c}$ strongly suggests that scattering and pairing in (TMTSF) $_{2}$ PF $_{6}$ 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(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ reveals a detailed similarity with (TMTSF) $_{2}$ PF $_{6}$ , suggesting that antiferromagnetic fluctuations play a similar role in the pnictides.

Accepted for publication in Phys. Rev. B. This paper focuses on a subset of the data presented in arXiv:0905.0964v1

Correlation between linear resistivity and $T_{c}$ in the Bechgaard salts and the pnictide superconductor Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

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Correlation between linear resistivity and Tc​ in the Bechgaard salts and the pnictide superconductor Ba(Fe1−x​Cox​)2​As2​

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Correlation between linear resistivity and $T_{c}$ in the Bechgaard salts and the pnictide superconductor Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$