Interplay of Fermi velocities and healing lengths in two-band superconductors

Abstract

By numerically solving the Bogoliubov-de Gennes equations for the single vortex state in a two-band superconductor, we demonstrate that the disparity between the healing lengths of two contributing condensates is strongly affected by the band Fermi velocities, even in the presence of the magnetic field and far beyond the regime of nearly zero Josephson-like coupling between bands. Changing the ratio of the band Fermi velocities alters the temperature dependence of the condensate lengths and significantly shifts parameters of the ``length-scales locking" regime at which the two characteristic lengths approach one another.

arXiv comment10 pages, 9 figures

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• Search for ambient superconductivity in the Lu-N-H system
• Two characteristic contributions to the superconducting state of 2$H$-NbSe${}_2$