Upper critical field in a trigonal unconventional superconductor UPt_3

Details Upper critical field in a trigonal unconventional superconductor UPt_3 Upper critical field in a trigonal unconventional superconductor UPt_3

2001-11-23

arxiv.org/abs/cond-mat/0111457v3

Physics

Condensed Matter

Superconductivity

8 pages, 5 figures

Scientific paper

10.1103/PhysRevB.65.224506

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 UPt_3 that has been recently found to possess trigonal crystalline structure. PACS numbers: 74.20.De, 74.70.Tx

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