Depinning transition in type-II superconductors

Abstract

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.

4 pages, 4 figures, 14 references

Cited by in corpus (8)

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• rf-studies of vortex dynamics in isotropic type-II superconductors
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• Comment to the paper : Collapse of the vortex-lattice inductance and shear modulus at the melting transition in untwinned YBa${}_2$Cu${}_3$O${}_7$, by Matl \QTR{em}{et al.}
• The vortex depinning transition in untwinned YBaCuO using complex impedance measurements