Magnetic hysteresis in the microwave surface resistance of Nb samples in the critical state

Details Magnetic hysteresis in the microwave surface resistance of Nb samples in the critical state Magnetic hysteresis in the microwave surface resistance of Nb samples in the critical state

2006-07-28

arxiv.org/abs/cond-mat/0607754v1

Eur. Phys. J. B 53 (2006) 315-322

Physics

Condensed Matter

Superconductivity

8 pages, 10 embedded figures, submitted to Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2006-00381-8

We discuss the hysteretic behavior of the field-induced variations of the microwave surface resistance in superconductors in the critical state. Measurements have been performed in a bulk sample of Nb and a powdered one at different values of the temperature. We discuss a model, based on the Coffey and Clem theory, in which we take into account the flux distribution inside the sample, due to the critical state. The experimental results are justified quantitatively in the framework of our model. We show that by fitting the experimental data it is possible to determine the value of the critical current density and its field dependence.

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