Andreev reflections in layered structures: Implications ifor high-Tc grain-boundary junctions

Alexander Golubov, Francesco Tafuri

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    Abstract

    Andreev reflection is investigated in layered anisotropic normal-metal–superconductor (N/S) systems in the case of an energy gap (Δ) in S not negligible with respect to the Fermi energy (EF), as it probably occurs with high critical temperature superconductors (HTSC’s). We find that in these limits retroreflectivity, which is a fundamental feature of Andreev reflection, is broken modifying sensitively transport across S/N interfaces. We discuss the consequences for supercurrents in HTSC Josephson junctions and for the midgap states in S-N contacts.
    Original languageEnglish
    Pages (from-to)15200-15203
    Number of pages4
    JournalPhysical Review B (Condensed Matter and Materials Physics)
    Volume62
    Issue number22
    DOIs
    Publication statusPublished - 2000

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