Fulde-Ferrell state in a ferromagnetic chiral superconductor with magnetic domain walls

Abstract

Motivated by recent theoretical and experimental progress in the heavy-fermion system UCoGe, we study ferromagnetic chiral superconductors in the presence of magnetic domains. Within mean-field approximations, it is shown that chiral superconducting domains are naturally induced by the ferromagnetic domains. The domain wall current flows in the opposite direction to the naively expected one as in the He3-A phase due to contributions from “unpaired electrons.” Consequently, the domain wall current flows in the same direction as the surface currents when the magnetic domain wall lies parallel to the sample surface, and therefore it contributes to the net current along the whole sample. We find that because of the noncancellation between the domain wall current and surface current, a Fulde-Ferrell-like superconducting state can be stabilized in an anisotropic sample for all the temperatures below the superconducting transition temperature.

Source-reported materials — not catalogue approval

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