Bound states at the interface between antiferromagnets and superconductors

Abstract

We present a detailed theoretical investigation of interfaces and junctions involving itinerant antiferromagnets. By solving the Bogoliubov-de Gennes equations with a tight-binding model on a square lattice, we study both the self-consistent order parameter fields proximate to interfaces between antiferromagnets (AF) and s-wave (sSC) or d-wave (dSC) superconductors, the dispersion of quasiparticle subgap states at interfaces and interlayers, and the local density of states (LDOS) as a function of distance from the interface. In addition, we present the quasiclassical approach to interfaces and junctions involving itinerant antiferromagnets developed in an earlier paper. Analytical results are in excellent agreement with what we obtain numerically. Strong effects of pair breaking in the presence of low-energy interface Andreev states are found in particular for AF/sSC interfaces when interface potentials are not too high. Potential barriers induce additional extrema in the dispersive quasiparticle spectra with corresponding peaks in the LDOS. Discrete quasiparticle dispersive levels in AF - normal metal (N) - AF systems are found to strongly depend on the misorientation angle of the magnetizations in the two antiferromagnets.

21 pp, 21 postscript figures, submitted to Phys. Rev. B

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• Novel Josephson Effects in d-wave Superconductor Junctions with Antiferromagnetic Interlayers
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• Solitonic in-gap modes in a superconductor-quantum antiferromagnet interface
• Recursion method for the quasiparticle structure of a single vortex with induced magnetic order
• Disorder and Critical Current Variability in Josephson Junctions
• Complete $T_c$ suppression and Néel triplets-mediated exchange in antiferromagnet-superconductor-antiferromagnet trilayers
• Interface probe for antiferromagnets using geometric curvature
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• Oscillatory superconducting transition temperature in superconductor/antiferromagnet heterostructures
• Proximity induced pseudogap in mesoscopic superconductor/normal-metal bilayers
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• Reconstruction of the DOS at the end of a S/F bilayer
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• Gap-like feature in the normal state of $\mathbf{X}(\mathbf{F}{\mathbf{e}}_{1-\mathbf{x}}\mathbf{C}{\mathbf{o}}_{\mathbf{x}}{)}_2\mathbf{A}{\mathbf{s}}_2$, $\mathbf{X}=\mathbf{Ba},\mathbf{Sr}$ and $\mathbf{F}{\mathbf{e}}_{1+\mathbf{y}}\mathbf{Te}$ revealed by Point Contact Spectroscopy
• Spectral properties of Andreev crystals
• Critical Currents in Conventional Josephson Junctions With Grain Boundaries