Effect of Mass Anisotropy on Critical Field for Superconducting Films

Abstract

The parallel critical field H_c3 to the film surface is calculated including the effect of the mass anisotropy for dirty superconductors. It is shown that H_c3 is larger near the transition temperature T_c and smaller at low temperatures than the perpendicular critical field H_c2 to the film surface, if m_⊥<<m_⁄⁄ where m_⊥ and m_⁄⁄ are the effective mass perpendicular and parallel to the film surface.