Toward one-band superconductivity in MgB2

Abstract

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.

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

References in corpus (3)

• Electronic Structure, Electron-Phonon Coupling, and Multiband Effects in MgB2
• Specific heat of MgB_2 after irradiation
• Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy

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• MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties
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