Competing effects of mass anisotropy and spin Zeeman coupling on the upper critical field of a mixed $d$- and s-wave superconductor

Abstract

Based on the linearized Eilenberger equations, the upper critical field $(H_{c2})$ of mixed d- and s-wave superconductors has been microscopically studied with an emphasis on the competing effects of mass anisotropy and spin Zeeman coupling. We find the mass anisotropy always enhance $H_{c2}$ while the Zeeman interaction suppresses $H_{c2}$. As required by the thermodynamics, we find $H_{c2}$ is saturated at zero temperature. We compare the theoretical calculations with recent experimental data of YBa${}_2$Cu${}_3$O${}_{7-+AFw-delta}$.

To appear in PRB in Feb. 2000

References in corpus (2)

• Experimental determination of B-T phase diagram of YBa_2Cu_3O_7-d to 150T for B perpendicular to c
• Quasiclassical theory of twin boundaries in High-T_c superconductors

Cited by in corpus (1)

• Antiferromagnetic superconductors with effective mass anisotropy in magnetic fields