Intermediate State in Type I superconducting sphere: pinning and size effect

Abstract

Simulations, based on the time dependent Ginzburg-Landau equations, show that the magnetization and spatial structure of the intermediate state strongly affected both by the radius of the sphere and by pinning center concentration. The intermediate states undergoes transformation from one-domain state in small clean sphere to multi-domain structure in big spheres. In spheres where part of the superconducting material replaced by the 0.5% randomly distributed normal phase (dirty case) the intermediate state demonstrates a well pronounced turbulence behavior.