AC Response of Thin Film Superconductors at Various Temperatures and Magnetic Fields

Details AC Response of Thin Film Superconductors at Various Temperatures and Magnetic Fields AC Response of Thin Film Superconductors at Various Temperatures and Magnetic Fields

1999-02-12

arxiv.org/abs/cond-mat/9902187v1

Physics

Condensed Matter

Latex file and 3 postscript figures, gives 13 pages text with figures built in

Scientific paper

10.1080/014186300254781

The basic theory of the linear and nonlinear ac susceptibilities of type-II superconductors is outlined for various geometries, e.g. circular and elliptic disks, rings, and strips of thin films or of thicker platelets in a perpendicular magnetic field. It is shown how the linear susceptibility depends on the linear complex resistivity or on the complex penetration depth, and the nonlinear susceptibility on the nonlinear dependence of the electric field on the current density and magnetic induction. The dependence of these constitutive laws on the temperature and on various material properties like pinning forces, pinning energies, structural defects, and granularity, leads to an implicit dependence of the ac susceptibility on these parameters.

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