Surface barrier effects in extreme type II superconductors

Abstract

The surface barrier effects in type H superconductors with high GinzburgLandau parameter are studied and the associated barrier field effects are considered as being due to the interactions between the vortex line and the associated screening currents with the external magnetic field and the surface of the specimen. Moreover, it is demonstrated that the penetration depth depends on the external field and the thickness of material and also that the order parameter is completely quenched at the sample surfaces for the applied field equal to the barrier field.