New aspects of microwave properties of Nb in the mixed state

Details New aspects of microwave properties of Nb in the mixed state New aspects of microwave properties of Nb in the mixed state

2009-10-23

arxiv.org/abs/0910.4506v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, presented at VORTEX VI Conference, to appear on Physica C

Scientific paper

We present a study of the frequency dependence of the vortex dynamics in a conventional superconductor. We have employed a swept-frequency, Corbino-disk technique to investigate the temperature (3.6K-Tc) and high-field (from Hc2/2 to Hc2) microwave complex resistivity in Nb thin (20-40 nm) films as a function of the frequency (1-20 GHz). We have found several previously unnoticed features: (i) a field-dependent depinning frequency in the GHz range; (ii) deviations from the accepted frequency dependence, that can be ascribed to some kind of vortex creep; (iii) the presence of switching phenomena, reminiscent of vortex instabilities. We discuss the possible origin of the features here reported.

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