Decoupling Transition I. Flux Lattices in Pure Layered Superconductors

Details Decoupling Transition I. Flux Lattices in Pure Layered Superconductors Decoupling Transition I. Flux Lattices in Pure Layered Superconductors

2004-05-02

arxiv.org/abs/cond-mat/0405015v2

Phys. Rev. B72, 024518 (2005)

Physics

Condensed Matter

Superconductivity

14 pages, 5 figures. New sections III, V. Companion to following article on "Decoupling and Depinning II: Flux lattices in dis

Scientific paper

10.1103/PhysRevB.72.024518

We study the decoupling transition of flux lattices in a layered superconductors at which the Josephson coupling J is renormalized to zero. We identify the order parameter and related correlations; the latter are shown to decay as a power law in the decoupled phase. Within 2nd order renormalization group we find that the transition is always continuous, in contrast with results of the self consistent harmonic approximation. The critical temperature for weak J is ~1/B, where B is the magnetic field, while for strong J it is~1/sqrt{B} and is strongly enhanced. We show that renormaliztion group can be used to evaluate the Josephson plasma frequency and find that for weak J it is~1/BT^2 in the decoupled phase.

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