Andreev Spectra and Subgap Bound States in Multiband Superconductors


Golubov, A.A. and Brinkman, A. and Tanaka, Yukio and Mazin, I.I. and Dolgov, O.V. (2009) Andreev Spectra and Subgap Bound States in Multiband Superconductors. Physical Review Letters, 103 (7). 077003. ISSN 0031-9007

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Abstract:A theory of Andreev conductance is formulated for junctions involving normal metals (N) and multiband superconductors (S) and applied to the case of superconductors with nodeless extended s±-wave order parameter symmetry, as possibly realized in the recently discovered ferropnictides. We find qualitative differences from tunneling into s-wave or d-wave superconductors that may help to identify such a state. First, interband interference leads to a suppression of Andreev reflection in the case of a highly transparent N/S interface and to a current deficit in the tunneling regime. Second, surface bound states may appear, both at zero and at nonzero energies.
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Copyright:© 2009 The American Physical Society
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Metis ID: 259187