Huge metastability in high-Tc superconductors induced by parallel magnetic field

R. G. Dias; J. A. Silva

doi:10.1103/PhysRevB.67.092511

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Huge metastability in high-Tc superconductors induced by parallel magnetic field

R. G. Dias, J. A. Silva

DOI 10.1103/PhysRevB.67.092511 · Physical Review B

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Abstract

We present a study of the temperature-magnetic-field phase diagram of homogeneous and inhomogeneous superconductivity in the case of a quasi-two-dimensional superconductor with an extended saddle point in the energy dispersion under a parallel magnetic field. At low temperature, a huge metastability region appears, limited above by a steep superheating critical field Hsh and below by a strongly reentrant supercooling field Hsc. We show that the Pauli limit Hp for the upper critical magnetic field is strongly enhanced due to the presence of the Van Hove singularity in the density of states. The formation of a nonuniform superconducting state is predicted to be very unlikely.