Optimum pinning of the vortex lattice in extremely type-II layered superconductors

Details Optimum pinning of the vortex lattice in extremely type-II layered superconductors Optimum pinning of the vortex lattice in extremely type-II layered superconductors

2002-05-11

arxiv.org/abs/cond-mat/0205231v2

Phys. Rev. B., v. 67, p. 144510 (2003)

Physics

Condensed Matter

Superconductivity

5 pgs., 4 figs. To appear in PRB. Added size study of hexatic phase

Scientific paper

10.1103/PhysRevB.67.144510

The two-dimensional (2D) vortex lattice in the extreme type-II limit is studied by Monte Carlo simulation of the corresponding 2D Coulomb gas, with identical pins placed at sites coinciding with the zero-temperature triangular vortex lattice. At weak pinning we find evidence for 2D melting into an intermediate hexatic phase. The strong pinning regime shows a Kosterlitz-Thouless transition, driven by interstitial vortex/anti-vortex excitations. A stack of such identical layers with a weak Josephson coupling models a layered superconductor with a triangular arrangement of columnar pins at the matching field. A partial duality analysis finds that layer decoupling of the flux-line lattice does not occur at weak pinning for temperatures below 2D melting.

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