Effect of disorder on the NMR relaxation rate in two-band superconductors

Details Effect of disorder on the NMR relaxation rate in two-band superconductors Effect of disorder on the NMR relaxation rate in two-band superconductors

2006-06-15

arxiv.org/abs/cond-mat/0606393v2

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.74.144510

We calculate the effect of nonmagnetic impurity scattering on the spin-lattice relaxation rate in two-band superconductors with the s-wave pairing symmetry. It is found that for the interaction parameters appropriate for MgB2 the Hebel-Slichter peak is suppressed by disorder in the limit of small interband impurity scattering rate. In the limit of strong impurity scattering, when the gap functions in the two bands become nearly equal, the single-band behavior is recovered with a well-defined coherence peak just below the transition temperature.

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