Critical magnetic field ratio of anisotropic magnetic superconductors

Abstract

The upper critical field, the lower critical field and the critical magnetic field ratio of anisotropic magnetic superconductors are calculated by Ginzburg-Landau theory analytically. The effect of the Ginzburg-Landau parameter (κ0), magnetic susceptibility (χ) and magnetic-to- anisotropic parameter ratio (θ) on the critical field ratio are considered. We find that the value of critical field ratio increases with increasing κ0 and θ, and decreases with increasing χ. The highest and the lowest value of critical field ratio is found in the diamagnetic superconductors and the ferromagnetic superconductors, respectively. © 2010 Elsevier B.V. All rights reserved.