Change of the vortex core structure in two-band superconductors at the impurity-scattering-driven s±/s++ crossover
Garaud, J., Silaev, M., & Babaev, E. (2017). Change of the vortex core structure in two-band superconductors at the impurity-scattering-driven s±/s++ crossover. Physical Review B, 96 (14), 140503(R). doi:10.1103/physrevb.96.140503
Julkaistu sarjassaPhysical Review B
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.
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± and s++ states.