Reversible magnetization of surface super conductivity.

Abstract

Since the prediction of surface superconductivity in type II materials many experiments have shown the existence of such a thermodynamic state [1]. Most of those results are obtained from the dynamic response of the superconducting state to the external perturbation (i.e. surface impedance, a.c. susceptibility, thermal conductivity, etc.). On the other hand very little experimental information is available to describe the equilibrium thermodynamic properties of the state. This is so because the small ratio of the superconducting volume to the total volume of the sample makes difficult the measurements of extensive thermodynamic properties.