Upper critical field in p-wave superconductors with anisotropic pairing interactions

✍ Scribed by Richard A. Klemm; Kurt Scharnberg

• Publisher: Elsevier Science
• Year: 1985
• Weight: 312 KB
• Volume: 135
• Category: Article
• ISSN: 0378-4363
• DOI: 10.1016/0378-4363(85)90433-4

✦ Synopsis

In hexagonal or tetragonal systems it is natural to assume an anisotropic pairing interaction. Taking this interaction to be spin independent and neglecting effects due to Fermi surface anisotropy, the resulting anisotropy in H¢2(T) has been calculated for all T in the clean limit. Hcz data on UPt 3 obtained near T c are compatible with this theory, but could also be explained assuming l> 0 singlet superconductivity. The disappearance of He2 anisotropy at low T, however, is not understood. Spin-orbit interaction is important for He2, if pair states belonging to different irreducible representations have different To's. Depending on the model parameters, this can lead to considerable He2 anisotropy in cubic systems, even if a spherical Fermi surface is assumed. In particular, anisotropic paramagnetic limiting of H¢2 could result. This model seems to be incapable, though, of explaining the H,2 data obtained for UBe13.