Josephson glass and decoupling of flux lattices in layered superconductors
arXiv:cond-mat/9711194 · doi:10.1103/PhysRevLett.80.1734
Abstract
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.
5 pages, 1 eps figure, Revtex, Phys. Rev. Lett. (submitted)
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