Multiband model for tunneling in MgB2 junctions

Details Multiband model for tunneling in MgB2 junctions Multiband model for tunneling in MgB2 junctions

2001-11-07

arxiv.org/abs/cond-mat/0111115v2

Physics

Condensed Matter

Superconductivity

minor corrections, published in Phys. Rev. B 65, 180517(R) (2002)

Scientific paper

10.1103/PhysRevB.65.180517

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.

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