Mid Term Review
Two Band Superconductivity: Vorticies in Magnesium Diboride
Speaker: Brendan Wilson, Department of Theoretical Physics Abstract:
Two band superconductivity was predicted shortly after the appearance of BCS theory. At present there are many examples of two band superconductors, namely cuprates, pnictides and MgB2. In these systems inter-band coupling is crucial and modifies many physical properties. In this talk I shall present some detailed accounts of superconductivity in MgB2 by considering both Ginzburg-Landau (GL) type phenomenological and BCS type microscopic models.
Since MgB2 is a type-II superconductor, magnetic field penetration into the superconductor producing vortices is an important aspect both for fundamental physics and applications. I shall discuss vortex physics of two interacting order parameters at the GL level.