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Nonlinear current response of one- and two-band superconductors

E. J. Nicol·J. P. Carbotte·D. J. Scalapino
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Abstract

We have calculated the nonlinear current of a number of single band s-wave electron-phonon superconductors. Among issues considered were those of dimensionality, strong electron-phonon coupling, impurities, and comparison with BCS. For the case of two bands, particular attention is paid to the role of anisotropy, the integration effects of the off-diagonal electron-phonon interaction, as well as inter- and intraband impurities. For the specific case of MgB2, we present results based on the known microscopic parameters of band theory.

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E. J. Nicol, J. P. Carbotte, D. J. Scalapino. 2005-10-10. Nonlinear current response of one- and two-band superconductors. https://doi.org/10.1103/physrevb.73.014521

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