Theory of superconducting-quasiparticle interface states
M. J. DeWeert, G. B. Arnold
DOI 10.1103/PhysRevB.39.11307 · Physical Review B
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Abstract
We calculate the thermodynamic Green’s functions for a BCS superconductor with a wall of magnetic material cleaving it into two semi-infinite regions. This is a model of an interface between a superconductor and a perfectly insulating ferromagnet. We show that the scattering of superconducting quasiparticles from a spin-polarized wall leads to resonant pair breaking and the formation of subgap bands in the tunneling density of states. These bands bear a superficial resemblance to the bands observed in bulk superconductors containing dilute concentrations of magnetic impurities. In the absence of spin-orbit or spin-flip scattering in the superconductor itself, the subgap bands accommodate only one spin of quasiparticle. The significance of this theory for superconductor-ferromagnetic insulator-superconductor tunneling is discussed.
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