Heat transport in RbFe 2 As 2 single crystals: Evidence for nodal superconducting gap
Heat transport in RbFe 2 As 2 single crystals: Evidence for nodal superconducting gap
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DOI：
10.1103/physrevb.91.024502
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发表时间：
2014-03
影响因子：
3.7
通讯作者：
Zhenyu Zhang;A. Wang;X. Hong;J. Zhang;B. Pan;J. Pan;Y. Xu;X. G. Luo;X. H. Chen;S. Y. Li
中科院分区：
文献类型：
--
作者：
Zhenyu Zhang;A. Wang;X. Hong;J. Zhang;B. Pan;J. Pan;Y. Xu;X. G. Luo;X. H. Chen;S. Y. Li
测量了铁基超导体{{MATHROM{RbFe}}{2}{\MATHORM{As}}{2}$单晶$({T}{c}\ensureMATHORM$2.1K)的面内热导率，结果表明，铁基超导体的面内热导率为100mK。在零场中，观测到显著的剩余线性项${\susureath{\kappa}}_{0}/T$=0.65 mW${\mathm{K}}^{\susuremathm{-}2}$${\mathm{cm}}^{\susureath{-}1}$为节点超导间隙提供了明确的证据。其场依赖关系与其姊妹化合物${\mathm{CsFe}}_{2}{\mathm{As}}_{2}$相似，其剩余电阻率为${\susureath{\rho}}_{0}$，介于脏的和干净的${\mathm{kFe}}_{2}{\mathm{as}}_{2}$之间。这些结果表明，(K，Rb，Cs){{\mathm{Fe}}{2}{\mathm{As}}{2}$系列超导体具有共同的节点带隙结构。
The in-plane thermal conductivity of iron-based superconductor ${\mathrm{RbFe}}_{2}{\mathrm{As}}_{2}$ single crystal $({T}_{c}\ensuremath{\approx}$ 2.1 K) was measured down to 100 mK. In zero field, the observation of a significant residual linear term ${\ensuremath{\kappa}}_{0}/T$ = 0.65 mW ${\mathrm{K}}^{\ensuremath{-}2}$ ${\mathrm{cm}}^{\ensuremath{-}1}$ provides clear evidence for nodal superdonducting gap. The field dependence of ${\ensuremath{\kappa}}_{0}/T$ is similar to that of its sister compound ${\mathrm{CsFe}}_{2}{\mathrm{As}}_{2}$ with comparable residual resistivity ${\ensuremath{\rho}}_{0}$ and lies between the dirty and clean ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$. These results suggest that the (K, Rb, Cs)${\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ serial superconductors have a common nodal gap structure.