Nodal superconductivity in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ induced by isovalent Ru substitution

Details Nodal superconductivity in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ induced by isovalent Ru substitution Nodal superconductivity in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ induced by isovalent Ru substitution

2011-06-27

arxiv.org/abs/1106.5417v2

Physical Review X 2, 011010 (2012)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We present the ultra-low-temperature heat transport study of an iron-based superconductor Ba(Fe$_{0.64}$Ru$_{0.36}$)$_2$As$_2$ ($T_c$ = 20.2 K), in which the superconductivity is induced by isovalent Ru substitution. In zero field we find a large residual linear term $\kappa_0/T$, more than 40% of the normal-state value. At low field, the $\kappa_0/T$ shows an $H^{1/2}$ dependence. These provide strong evidences for nodes in the superconducting gap of Ba(Fe$_{0.64}$Ru$_{0.36}$)$_2$As$_2$, which mimics that in another isovalently substituted superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$. Our results show that the isovalent Ru substitution can also induce nodal superconductivity in BaFe$_2$As$_2$, as P does, and they may have the same origin. We further compare them with other two nodal superconductors LaFePO and LiFeP.

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