Andreev reflection in layered structures: implications for high T_c grain boundary Josephson junctions

Abstract

Andreev reflection is investigated in layered anisotropic normal metal / superconductor (N/S) systems in the case of an energy gap Δin S not negligible with respect to the Fermi energy E_F, as it probably occurs with high critical temperature superconductors (HTS). We find that in these limits retro-reflectivity, which is a fundamental feature of Andreev reflection, is broken modifying sensitively transport across S/N interfaces. We discuss the consequences for supercurrents in HTS Josephson junctions and for the midgap states in S-N contacts

4 pages, 4 figures, to be published in Phys. Rev. B

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• Theory of two-dimensional macroscopic quantum tunneling in YBa${}_2$ Cu${}_3$ O${}_{7-\delta }$ Josephson junctions coupled to an LC circuit
• Local tunneling probe of (110) Y_0.95Ca_0.05Ba_2Cu_3O_7-delta thin films in a magnetic field
• Suppressed Andreev Reflection at the Normal-Metal / Heavy-Fermion Superconductor CeCoIn${}_5$ Interface