Finite Temperature Depinning of a Flux Line from a Nonuniform Columnar Defect

Details Finite Temperature Depinning of a Flux Line from a Nonuniform Columnar Defect Finite Temperature Depinning of a Flux Line from a Nonuniform Columnar Defect

1998-09-08

arxiv.org/abs/cond-mat/9809132v1

Physics

Condensed Matter

Superconductivity

RevTeX, 4 pages, 3 EPS figures embedded with epsf.sty

Scientific paper

10.1103/PhysRevB.59.188

A flux line in a Type-II superconductor with a single nonuniform columnar defect is studied by a perturbative diagrammatic expansion around an annealed approximation. The system undergoes a finite temperature depinning transition for the (rather unphysical) on-the-average repulsive columnar defect, provided that the fluctuations along the axis are sufficiently large to cause some portions of the column to become attractive. The perturbative expansion is convergent throughout the weak pinning regime and becomes exact as the depinning transition is approached, providing an exact determination of the depinning temperature and the divergence of the localization length.

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