Upper critical field for an unconventional superconducting film: A kink due to the boundary conditions.
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Boundary conditions for an unconventional superconducting order parameter are obtained on the basis of a microscopic theory. The upper critical field in a superconducting film is examined for unconventional superconductors with a two-component order parameter and is compared with the case of accidental degeneracy. It is shown that for both cases the temperature dependences of the upper critical field in a superconducting film may depend substantially on the quality of boundaries, and under certain conditions have a kink due to the influence of film boundaries. The location of a kink point appears to be dependent on film thickness. If for a massive sample there is another reason for the existence of a kink, the interplay of the reasons may lead to a specific behavior of a kink point location as a function of temperature or film thickness. A test is suggested permitting to distinguish between E1 and E2 types of pairing in a hexagonal superconductor near Tc. © 1995 The American Physical Society.
Phys Rev B Condens Matter
author list (cited authors)
Barash, Y. S., Galaktionov, A. V., & Svidzinsky, A. A.
complete list of authors
Barash, YS||Galaktionov, AV||Svidzinsky, AA
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