Toward one-band superconductivity in MgB2

Details Toward one-band superconductivity in MgB2 Toward one-band superconductivity in MgB2

2003-04-21

arxiv.org/abs/cond-mat/0304456v2

Phys. Rev. B 68, 132505 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.132505

The two-gap model for superconductivity in MgB2 predicts that interband impurity scattering should be pair breaking, reducing the critical temperature. This is perhaps the only prediction of the model that has not been confirmed experimentally. It was previously shown theoretically that common substitutional impurities lead to negligible interband scattering - if the lattice is assumed not to distort. Here we report theoretical results showing that certain impurities can indeed produce lattice distortions sufficiently large to create measurable interband scattering. On this basis, we predict that isoelectronic codoping with Al and Na will provide a decisive test of the two-gap model.

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