Phys. Rev. B 61, 4200–4205 (2000)Competing effects of mass anisotropy and spin-Zeeman coupling on the upper critical field of a mixed d- and s-wave superconductorReceived 16 August 1999; revised 22 October 1999; published in the issue dated 1 February 2000 Based on the linearized Eilenberger equations, the upper critical field (Hc2) 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 enhances 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.4200
DOI:
10.1103/PhysRevB.61.4200
PACS:
74.20.Mn, 74.25.Bt
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