Josephson glass and decoupling of flux lattices in layered superconductors

Details Josephson glass and decoupling of flux lattices in layered superconductors Josephson glass and decoupling of flux lattices in layered superconductors

1997-11-19

arxiv.org/abs/cond-mat/9711194v1

Phys. Rev. Lett. 80 (1998) 1734

Physics

Condensed Matter

Superconductivity

5 pages, 1 eps figure, Revtex, Phys. Rev. Lett. (submitted)

Scientific paper

10.1103/PhysRevLett.80.1734

Phase transitions of a flux lattice in layered superconductors with magnetic field perpendicular to the layers and in presence of disorder are studied. We find that the Josephson coupling between layers leads to a strongly pinned Josephson glass (JG) phase at low temperatures and fields. The JG phase undergoes either a decoupling transition with increasing field or a depinning transition with increasing temperature. The resulting phases undergo further depinning and decoupling transitions, respectively, resulting in a phase diagram with a multicritical point where four phases meet. The phase diagram accounts for unusual data on Bi_2Sr_2CaCu_2O_8 such as the "second peak" transition and the recently observed depinning transitions.

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