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

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

2000-10-06

arxiv.org/abs/cond-mat/0010105v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.62.15200

Andreev reflection is investigated in layered anisotropic normal metal / superconductor (N/S) systems in the case of an energy gap \Delta in 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

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