Thermodynamic Magnetic Field and Specific Heat Jump of a Bulk Superconductor MgB₂Using Two-Band Ginzburg–Landau Theory

Abstract

Temperature dependence of the thermodynamic magnetic field for the superconducting magnesium diboride, MgB 2 , is studied in the vicinity of T c using a two-band Ginzburg–Landau (G–L) theory. The results are shown to be in good agreement with calculations from experimental data. In addition, the two-band G–L theory gives a smaller specific heat jump, than a single-band G–L theory.