Robust nodal superconductivity induced by isovalent doping in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ and BaFe$_2$(As$_{1-x}$P$_x$)$_2$

X. Qiu; S. Y. Zhou; H. Zhang; B. Y. Pan; X. C. Hong; Y. F. Dai; Man Jin Eom; Jun Sung Kim; Z. R. Ye; Y. Zhang; D. L. Feng; S. Y. Li

paper

Robust nodal superconductivity induced by isovalent doping in Ba(Fe $_{1 - x}$ Ru $_{x}$ ) $_{2}$ As $_{2}$ and BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

arXiv:1112.2421

Abstract

We present the ultra-low-temperature heat transport study of iron-based superconductors Ba(Fe $_{1 - x}$ Ru $_{x}$ ) $_{2}$ As $_{2}$ and BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ . For optimally doped Ba(Fe $_{0.64}$ Ru $_{0.36}$ ) $_{2}$ As $_{2}$ , a large residual linear term $κ_{0} / T$ at zero field and a $H$ dependence of $κ_{0} (H) / T$ are observed, which provide strong evidences for nodes in the superconducting gap. This result demonstrates that the isovalent Ru doping can also induce nodal superconductivity, as P does in BaFe $_{2}$ (As $_{0.67}$ P $_{0.33}$ ) $_{2}$ . Furthermore, in underdoped Ba(Fe $_{0.77}$ Ru $_{0.23}$ ) $_{2}$ As $_{2}$ and heavily underdoped BaFe $_{2}$ (As $_{0.82}$ P $_{0.18}$ ) $_{2}$ , $κ_{0} / T$ manifests similar nodal behavior, which shows the robustness of nodal superconductivity in the underdoped regime and puts constraint on theoretical models.

arXiv comment5 pages, 4 figures - with two underdoped samples added, this paper supersedes arXiv:1106.5417

Robust nodal superconductivity induced by isovalent doping in Ba(Fe1−x​Rux​)2​As2​ and BaFe2​(As1−x​Px​)2​

Abstract

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Robust nodal superconductivity induced by isovalent doping in Ba(Fe $_{1 - x}$ Ru $_{x}$ ) $_{2}$ As $_{2}$ and BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$