AC conductivity of a niobium thin film in a swept magnetic field

Details AC conductivity of a niobium thin film in a swept magnetic field AC conductivity of a niobium thin film in a swept magnetic field

2011-09-26

arxiv.org/abs/1109.5519v1

Physics

Condensed Matter

Superconductivity

5 pages and 6 figures

Scientific paper

We report the results of the measurement the ac conductivity of a Nb superconducting thin film in a swept dc magnetic field applied parallel to the surface. Analysis of the experimental data in a mixed state shows that changes of the ac conductivity are due to generation by the swept magnetic field unpinned vortices on the film surface. The number of these vortices is much smaller than the pinned ones and their density decreases with increasing of both the amplitude and frequency of an ac field.

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