Competing effects of mass anisotropy and spin Zeeman coupling on the upper critical field of a mixed d- and s-wave superconductor
نویسندگان
چکیده
Based on the linearized Eilenberger equations, the upper critical field (Hc2) of mixed dand 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 Hc2 while the Zeeman interaction suppresses Hc2. As required by the thermodynamics, we find Hc2 is saturated at zero temperature. We compare the theoretical calculations with recent experimental data of YBa2Cu3O7−δ. PACS numbers: 74.20.-z,74.20.Mn,74.25.Bt
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