Theory of parity-violated Cooper pairs in weakly noncentrosymmetric superconductors

Article

关键词: VORTEX STATE;    TRANSPORT;    Y2C3;   

DOI  :  10.1103/PhysRevB.76.184504

来源: SCIE

【 摘 要 】

We propose that in noncentrosymmetric superconductors with weakly asymmetric spin-orbit interaction, the field-induced pair correlation between the spin-orbit split different bands ignored in previous studies yields unique effects; i.e., the Pauli depairing effect is anisotropic in the momentum space and, as a result, magnetic fields induce a point-node-like anisotropic gap structure of the quasiparticle energy even for isotropic s-wave states, which seriously affects thermodynamic quantities at low temperatures. Also, it is shown that when the magnitude of the spin-orbit interaction is smaller than the superconducting gap, the specific heat as a function of the magnetic field exhibits a two-gap-like behavior, even when there is only a single gap. These features characterize parity-violated Cooper pairs in weakly noncentrosymmetric systems. We suggest the possible detection of these effects in the superconductor with weakly broken inversion symmetry Y(2)C(3).

【 授权许可】

Free