Andreev bound states at nonmagnetic impurities in superconductor/antiferromagnet heterostructures

G. A. Bobkov; I. V. Bobkova; A. M. Bobkov

doi:10.1103/PhysRevB.109.214508

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Andreev bound states at nonmagnetic impurities in superconductor/antiferromagnet heterostructures

G. A. Bobkov, I. V. Bobkova, A. M. Bobkov

DOI 10.1103/PhysRevB.109.214508 · Physical Review B

T1

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Abstract

Andreev bound states can occur at single impurities in superconductors if the impurities suppress superconductivity for a given system. In particular, well-known Yu-Shiba-Rusinov states occur at magnetic impurities in conventional s-wave superconductors. Here we demonstrate that nonmagnetic impurities in superconductor/antiferromagnet (S/AF) heterostructures with conventional intraband s-wave pairing also produce Andreev bound states. Analogously to the Yu-Shiba-Rusinov bound states the bound states in S/AF bilayers are spin split, but the spin of a particular bound state is determined by the sublattice to which the impurity belongs. The standard decay of the bound state local density of states is superimposed by atomic oscillations related to the staggered character of the exchange field in the host material and by another oscillating pattern produced by finite-momentum Néel triplet pairing generated at the impurity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown