Restoration of Superconductivity in High Parallel Magnetic Fields in Layered Superconductors
Abstract
We derive an equation determining the upper critical field H||c2\(T\) parallel to conducting planes of a layered superconductor from the BCS theory. It extends the descriptions of H||c2\(T\) within the Ginzburg-Landau-Abrikosov-Gor'kov theory and the Lawrence-Doniach model to the case of strong magnetic fields. From this equation, it follows that orbital effects of an electron motion along an open Fermi surface in a magnetic field start to restore superconductivity at magnetic fields higher than the quasiclassical upper critical field and result in the appearance of a reentrant phase with Tc\(H\)~=Tc\(0\). A stability of the reentrant phase against fluctuations is discussed.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 1998
- DOI:
- 10.1103/PhysRevLett.80.2697
- Bibcode:
- 1998PhRvL..80.2697L