Change of the vortex core structure in two-band superconductors at impurity-scattering-driven $s_{\pm }/s_{++}$ crossover

Abstract

We report a nontrivial transition in the core structure of vortices in two-band superconductors as a function of interband impurity scattering. We demonstrate that, in addition to singular zeros of the order parameter, the vortices there can acquire a circular nodal line around the singular point in one of the superconducting components. It results in the formation of the peculiar "moat"-like profile in one of the superconducting gaps. The moat-core vortices occur generically in the vicinity of the impurity-induced crossover between $s_{\pm }$ and $s_{++}$ states.

arXiv comment5 pages, 2 figures

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• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• Field-induced coexistence of $s_{++}$ and $s_{\pm }$ superconducting states in dirty multiband superconductors