Theory of Superconductivity in CeMIn5 (M=Co, Rh, Ir) on the Basis of the Three Dimensional Periodic Anderson Model
Theory of Superconductivity in CeMIn5 (M=Co, Rh, Ir) on the Basis of the Three Dimensional Periodic Anderson Model
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DOI：
10.1143/jpsj.75.024713
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发表时间：
2006-02
影响因子：
1.7
通讯作者：
Kazunori Tanaka;H. Ikeda;Y. Nisikawa;K. Yamada
中科院分区：
文献类型：
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作者：
Kazunori Tanaka;H. Ikeda;Y. Nisikawa;K. Yamada
CeMIn 5（M=Co，Rh，Ir）是具有HoCoGa 5型结构的重费米子化合物。CeCoIn 5和CeIrIn 5在常压下分别达到超导状态，Tc = 2.3和0.4K。另一方面，CeRhIn 5在环境压力下是反铁磁体，并且在大于1.6 GPa的压力下变成超导体。核四极共振（NQR），热导率，比热和电阻率的测量表明，在CeMIn 5的超导电性具有线节点。然而，dx 2 -y2和dxy之间的配对对称性是有争议的基础上的热导率和比热在磁场下的角度依赖的测量，分别。因此，我们通过详细的计算研究了CeMIn 5的差距结构.为了再现CeMIn 5的能带结构特征，我们引入了三维周期性安德森模型（PAM）并求解了Eliashberg方程.因此，我们确定CeMIn 5的差距结构为d × 2 -..
CeMIn 5 (M=Co, Rh, Ir) are heavy fermion compounds with a HoCoGa 5 -type structure. CeCoIn 5 and CeIrIn 5 become superconducting at ambient pressure with T c =2.3 and 0.4 K, respectively. On the other hand, CeRhIn 5 is an antiferromagnet at ambient pressure, and becomes superconducting under pressures greater than 1.6 GPa. Nuclear-quadrupole-resonance (NQR), thermal conductivity, specific heat, and electrical resistivity measurements indicate that the superconductivity in CeMIn 5 has line nodes. However, the pairing symmetry between d x 2 - y 2 and d x y is controversial based on the angle-dependent measurements of thermal conductivity and specific heat under the magnetic field, respectively. Therefore, we investigate the gap structure of CeMIn 5 by a detailed calculation. In order to reproduce the band structure characteristics of CeMIn 5 , we introduce a three-dimensional (3D) periodic Anderson model (PAM) and solve the Eliashberg equations. Thus, we identify the gap structure of CeMIn 5 as the d x 2 - ...