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APS » Journals » Phys. Rev. B » Volume 65 » Issue 18
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Phys. Rev. B 65, 180517(R) (2002) [4 pages]

Multiband model for tunneling in MgB2 junctions

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A. Brinkman, A. A. Golubov, and H. Rogalla
Department of Applied Physics and MESA+ Research Institute, University of Twente, 7500 AE, Enschede, The Netherlands

O. V. Dolgov, J. Kortus, Y. Kong, O. Jepsen, and O. K. Andersen
Max-Plank Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569, Stuttgart, Germany

Received 6 November 2001; published 9 May 2002

A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained from an extended Eliashberg formalism, using the results of band structure calculations. The temperature and angle dependencies of MgB2 tunneling spectra and the Josephson critical current are calculated. The conditions for observing one or two gaps are given. We argue that the model may help to settle the current debate concerning two-band superconductivity in MgB2.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.180517
DOI:
10.1103/PhysRevB.65.180517
PACS:
74.50.+r, 74.70.Ad, 74.80.Fp, 85.25.Cp
 
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