Upper critical field for an unconventional superconducting film: A kink due to the boundary conditions

Yu. S. Barash; A. V. Galaktionov; A. A. Svidzinsky

doi:10.1103/PhysRevB.52.10344

← Back to search

Upper critical field for an unconventional superconducting film: A kink due to the boundary conditions

Yu. S. Barash, A. V. Galaktionov, A. A. Svidzinsky

DOI 10.1103/PhysRevB.52.10344 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown