rf-studies of vortex dynamics in isotropic type-II superconductors

Details rf-studies of vortex dynamics in isotropic type-II superconductors rf-studies of vortex dynamics in isotropic type-II superconductors

1998-05-07

arxiv.org/abs/cond-mat/9805093v1

Physics

Condensed Matter

Superconductivity

20 pages, 6 figures, 28 references

Scientific paper

We have measured the surface impedance of thick superconductors in the mixed state over a broad 2 kHz - 20 MHz frequency range. The depinning cross-over is observed; but it is much broader than expected from classical theories of pinning. A striking result is the existence of size effects which invalidate the common interpretation of the low-frequency surface inductance in terms of a single penetration depth. Instead, a two-mode description of vortex dynamics, assuming free vortex flow in the bulk and surface pinning, accounts quantitatively for the spectrum of the complex apparent penetration depth.

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