Andreev Spectra and Subgap Bound States in Multiband Superconductors

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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.
Item Type:Article
Copyright:© 2009 The American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/73636
Official URL:http://dx.doi.org/10.1103/PhysRevLett.103.077003
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