Abstract
We investigate the effects of Andreev bound states due to the unconventional pairing on the inverse proximity effect of ferromagnet/superconductor junctions. Utilizing quasiclassical Eilenberger theory, we obtain the magnetization penetrating into the superconductor. We show that in a wide parameter range the direction of the induced magnetization is determined by two factors: whether Andreev bound states are present at the junction interface and the sign of the spin-mixing angle. In particular, when Andreev bound states appear at the interface, the direction of the induced magnetization is opposite to that without Andreev bound states. We also clarify the conditions under which the inverted induced magnetization appears. Applying this novel effect helps distinguishing the pairing symmetry of a superconductor.
Highlights
Superconductors (SCs) dominated by an exotic pairing interaction are often so-called unconventional superconductors (USCs), which break apart from the global phase symmetry one or more additional symmetries of the normal state
We investigate the effects of Andreev bound states due to the unconventional pairing on the inverse proximity effect of ferromagnet/superconductor junctions
We show that in a wide parameter range the direction of the induced magnetization is determined by two factors: whether Andreev bound states are present at the junction interface and the sign of the spin-mixing angle
Summary
Superconductors (SCs) dominated by an exotic pairing interaction are often so-called unconventional superconductors (USCs), which break apart from the global phase symmetry one or more additional symmetries of the normal state. In a ferromagnet/SC (F/SC) junction, the magnetization in the F penetrates into the SC on the length scale of the superconducting coherence length ξ0 This is called the (magnetic) inverse proximity effect (IPE) [64,65,66,67,68,69,70,71]. It was first studied in a ballistic junction of a ferromagnetic insulator (FI) and an s-wave SC [64] In this case, the induced magnetization is antiparallel to the magnetization in the FI. Using first a onedimensional model, we show that for a single quasiclassical trajectory the direction of the induced magnetization is determined by two factors: existence of ABSs and the sign of the spin-mixing angle.
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