Decoupling and decommensuration in layered superconductors with columnar defects

Details Decoupling and decommensuration in layered superconductors with columnar defects Decoupling and decommensuration in layered superconductors with columnar defects

2002-11-05

arxiv.org/abs/cond-mat/0211080v2

Phys. Rev. B67, 140505(R) (2003)

Physics

Condensed Matter

Superconductivity

5 pages, Revtex

Scientific paper

10.1103/PhysRevB.67.140505

We consider layered superconductors with a flux lattice perpendicular to the layers and random columnar defects parallel to the magnetic field B. We show that the decoupling transition temperature Td, at which the Josephson coupling vanishes, is enhanced by columnar defects by an amount ~B^2 relative to Td. Decoupling by increasing field can be followed by a reentrant recoupling transition for strong disorder. We also consider a commensurate component of the columnar density and show that its pinning potential is renormalized to zero above a critical long wavelength disorder. This decommnesuration transition may account for a recently observed kink in the melting line.

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