Lectures on magnetic properties of a Superconductor [MatSciRep:28]

Abstract

Any microscopic theory of superconductivity leads to the derivation of London's equation which connects the applied magnetic field and the current in the bulk superconductor; Electrodynamics of Superconductors is discussed in this Report; Statistical mechanics of a system of free fermions is reviewed briefly; When a multiply connected superconductor in a magnetic field, is cooled below the transition temperature, the expelled flux trapped inside the hole does not have arbitrary values but assumes a value which are multiples of a basic unit. It is aimed to show that when 'A' is such that the trapped flux, is the correct quantized value, the corresponding bulk current vanishes. When 'A' is slightly different there exists a bulk current, which is proportional to the deviation from the correct A. These lectures also deals with Deviation of Landau-Ginzburg Equations;