Detailed investigation of gap structure and specific heat in the p-wave superconductor Sr2RuO4
Detailed investigation of gap structure and specific heat in the p-wave superconductor Sr2RuO4
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DOI：
10.1143/jpsj.71.404
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发表时间：
2002-02-01
影响因子：
1.7
通讯作者：
Yamada, K
中科院分区：
文献类型：
--
作者：
Nomura, T;Yamada, K
我们提出了高度各向异性的p波超导带隙结构的Sr2RuO4，这是确定微观的基础上的微扰理论的库仑能量的基础上，通过求解线性Eliashberg方程。根据基本BCS理论，我们追踪了T_c以下的差距函数的演化，计算了帽上具有类似于（k（x）+ ik（y））（z）对称性的d（k）超导态的比热。差距结构的强动量依赖性提供了线节点状的幂律比热行为，即使在极低的温度。结果表明，对于中等强度的轨道间耦合，比热计算结果与实验结果吻合较好。
We present the highly anisotropic p-wave superconducting gap structure of Sr2RuO4, which was determined microscopically by solving the linearized Eliashberg equation on the basis of the perturbation theory with respect to the Coulomb energy at Ru sites. We trace the evolution of the gap function below T-c, following the elementary BCS theory, and calculate specific heat for the superconducting state with the symmetry represented by d(k) similar to (k(x) + ik(y))(z) over cap. The strong momentum dependences of the gap structure provide a line-node-like power-law behavior of the specific heat even at extremely low temperature. As a result, the calculation results of specific heat agree with die experimental results well for moderately strong inter-orbit couplings.