Relation between the structural phase transition and superconductivity in CuxIrTe2-ySey
Relation between the structural phase transition and superconductivity in CuxIrTe2-ySey
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CuxIrTe2-ySey结构相变与超导性的关系
DOI：
10.1103/physrevb.94.134507
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发表时间：
2016
影响因子：
3.7
通讯作者：
and S. Ishiwata
中科院分区：
文献类型：
--
作者：
M. Kamitani;H. Sakai;Y. Tokura;and S. Ishiwata
我们结合硒取代和铜嵌入研究了结构转变与ir -二聚体形成和超导性之间的关系。不考虑结构转变温度（）随Se含量（）的增加而增加，Cu的插入使超导性强劲地出现。随着Cu含量的增加，有减小的趋势，随后出现超导现象，在靠近结构相边界的最佳Cu浓度处，超导临界温度最高。基于输运和热力学性质，发现电子-声子耦合常数在结构相边界附近增强，这表明结构不稳定性对掺杂中的超导性起重要作用。从0增加到0.5，inat增加约80%，而inat减少约20%。这可以通过层间杂化在Se取代上的减弱来理解，导致两者之间的弱负相关。
We have investigated the relation between structural transition with Ir-dimer formation and superconductivity inby combining the Se substitution and the Cu intercalation. Regardless of the structural transition temperature (), which increases with increasing the Se content () in, superconductivity emerges robustly by the Cu intercalation. As the Cu contentinincreases,tends to decrease, followed by the emergence of superconductivity with showing the highest critical temperature () at the optimum Cu concentration () close to the structural phase boundary. Based on the transport and thermodynamic properties, the electron-phonon coupling constant is found to be enhanced near the structural phase boundary, which suggests an essential role of the structural instability for the superconductivity in doped. With increasingfrom 0 to 0.5 inatincreases by about 80%, whereasatdecreases by about 20%. This can be understood by the weakening of the interlayer hybridization upon the Se substitution, resulting in the weak but negative correlation betweenandthrough.