Tanaka Y, Golubov A A
Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
Phys Rev Lett. 2007 Jan 19;98(3):037003. doi: 10.1103/PhysRevLett.98.037003. Epub 2007 Jan 16.
We present a general theory of the proximity effect in junctions between diffusive normal metals (DN) and superconductors. Various possible symmetry classes in a superconductor are considered: even-frequency spin-singlet even-parity (ESE) state, even-frequency spin-triplet odd-parity state, odd-frequency spin-triplet even-parity (OTE) state and odd-frequency spin-singlet odd-parity state. It is shown that the pair amplitude in a DN belongs, respectively, to an ESE, OTE, OTE, and ESE pairing state since only the even-parity s-wave pairing is possible due to the impurity scattering.
我们提出了一个关于扩散型正常金属（DN）与超导体之间结中邻近效应的一般理论。考虑了超导体中各种可能的对称类：偶频自旋单重态偶宇称（ESE）态、偶频自旋三重态奇宇称态、奇频自旋三重态偶宇称（OTE）态和奇频自旋单重态奇宇称态。结果表明，由于杂质散射仅允许偶宇称s波配对，DN中的对振幅分别属于ESE、OTE、OTE和ESE配对态。
