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

DOI：

10.1103/physrevx.2.011010

发表时间：

2011-12

期刊：

arXiv: Superconductivity

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

X. Qiu;S. Zhou;H. Zhang;B. Pan;X. Hong;Y. F. Dai;M. Eom;J. S. Kim;Z. Ye;Y. Zhang

我们提出了铁基超导体 Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ 和 BaFe$_2$(As$_{1-x}$P$_x$)$_2$ 的超低温热传输研究。对于最佳掺杂的Ba(Fe$_{0.64}$Ru$_{0.36}$)$_2$As$_2$，在零场处观察到大的剩余线性项$\kappa_0/T$和$\kappa_0(H)/T$的$\sqrt{H}$依赖性，这为超导间隙中的节点提供了有力的证据。这一结果表明，等价Ru掺杂也可以诱导节点超导，就像BaFe$_2$(As$_{0.67}$P$_{0.33}$)$_2$中的P一样。此外，在欠掺杂的Ba(Fe$_{0.77}$Ru$_{0.23}$)$_2$As$_2$和重度欠掺杂的BaFe$_2$(As$_{0.82}$P$_{0.18}$)$_2$中，$\kappa_0/T$表现出相似的节点行为，这表明了欠掺杂状态下节点超导性的鲁棒性，并对理论模型提出了约束。

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 $\kappa_0/T$ at zero field and a $\sqrt{H}$ dependence of $\kappa_0(H)/T$ 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$_{0.18}$)$_2$, $\kappa_0/T$ manifests similar nodal behavior, which shows the robustness of nodal superconductivity in the underdoped regime and puts constraint on theoretical models.

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

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