Currents induced by magnetic impurities in superconductors with spin-orbit coupling
arXiv:1505.01672 · doi:10.1103/PhysRevLett.115.116602
Abstract
We show that superconducting currents are generated around magnetic impurities and ferromagnetic islands proximity-coupled to superconductors with finite spin-orbit coupling. Using the Ginzburg-Landau theory, T-matrix calculation, as well as self-consistent numerical simulation on a lattice, we find a strong dependence of the current on the direction and magnitude of the magnetic moment. We establish that in the case of point magnetic impurities, the current is carried by the induced Yu-Shiba-Rusinov (YSR) subgap states. In the vicinity of the phase transition, where the YSR states cross at zero energy, the current increases dramatically. Furthermore, we show that the currents are orthogonal to the local spin polarization and, thus, can be probed by measuring the spin-polarized local density of states.
arXiv comment10 pages, 4 figures. Corresponds to the published version. Footnote (Ref. [34]) added to comment on the magnetoelectric coefficients at the finite temperature
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