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

Preview

PDF
287Kb

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
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/73636
Official URL:	http://dx.doi.org/10.1103/PhysRevLett.103.077003
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 259187