Depinning transition in type-II superconductors

Details Depinning transition in type-II superconductors Depinning transition in type-II superconductors

1997-05-02

arxiv.org/abs/cond-mat/9705017v2

Physical Review Letters, Volume 79, Number 13, page 2538 (1997)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, 14 references

Scientific paper

10.1103/PhysRevLett.79.2538

The surface impedance Z(f) of conventional isotropic materials has been carefully measured for frequencies f ranging from 1 kHz to 3 MHz, allowing a detailed investigation of the depinning transition. Our results exhibit the irrelevance of classical ideas to the dynamics of vortex pinning. We propose a new picture, where the linear ac response is entirely governed by disordered boundary conditions of a rough surface, whereas in the bulk vortices respond freely. The universal law for Z(f) thus predicted is in remarkable agreement with experiment, and tentatively applies to microwave data in YBaCuO films.

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