Lebed A G
Department of Physics, University of Arizona, 1118 E. 4th Street, Tucson, Arizona 85721, USA.
Phys Rev Lett. 2006 Jan 27;96(3):037002. doi: 10.1103/PhysRevLett.96.037002. Epub 2006 Jan 25.
Paramagnetic effects are shown to result in the appearance of a triplet component of order parameter in a vortex phase of a -wave superconductor in the absence of impurities. This component, which breaks parity and spin-rotational symmetries of Cooper pairs, is expected to be of the order of unity in a number of modern superconductors such as organic, high Tc, and some others. A generic phase diagram of such type-IV superconductors, which are singlet ones at H=0 and in the Meissner phase, and characterized by singlet-triplet mixed Copper pairs Deltas+iDeltat with broken symmetries in a vortex phase, is discussed.
结果表明，在无杂质的a波超导体的涡旋相中，顺磁效应会导致序参量出现三重态分量。在许多现代超导体，如有机超导体、高温超导体等中，该分量破坏了库珀对的宇称和自旋旋转对称性，预计其量级为1。文中讨论了这类IV型超导体的通用相图，它们在H = 0时以及迈斯纳相中为单重态超导体，在涡旋相中以具有对称性破缺的单重态 - 三重态混合库珀对Deltas + iDeltat为特征。
