Upper critical field in a trigonal unconventional superconductor: UPt3 - art. no. 224506

摘要

A theory of the upper critical field in a trigonal superconductor with a two-component order-parameter is developed. We demonstrate the existence of sixfold modulations of the upper critical field in the basal plane. The form of the angular dependence of H-c2 in the plane of the main symmetry axis is studied in the whole range of phenomenological rigidity coefficients. A qualitative dependence of these coefficients on the form of the Fermi surface is established. The results obtained are discussed in connection with the measurements of the direction dependence of H-c2 in the heavy-fermion superconductor UPt3, which has been recently found to possess trigonal crystalline structure. References: 14