# Superconductivity at metal-antiferromagnetic insulator interfaces

## TL;DR

This paper demonstrates that a tri-layer of metal between two antiferromagnetic insulators can exhibit superconductivity mediated by magnon interactions, with a critical temperature around 1 K and a d-wave pairing symmetry.

## Contribution

It introduces a novel mechanism for superconductivity at metal-antiferromagnetic insulator interfaces, highlighting the role of magnon coupling and Umklapp scattering.

## Key findings

- Superconductivity can be induced at metal-antiferromagnetic insulator interfaces.
- The critical temperature is related to the magnon gap, estimated around 1 K.
- The pairing symmetry is d-wave due to Umklapp scattering effects.

## Abstract

Magnons in antiferromagnetic insulators couple strongly to conduction electrons in adjacent metals. We show that this interfacial tie can lead to superconductivity in a tri-layer consisting of a metal sandwiched between two antiferromagnetic insulators. The critical temperature is closely related to the magnon gap, which can be in the THz range. We estimate the critical temperature in MnF$_2$-Au-MnF$_2$ to be on the order of 1 K. The Umklapp scattering at metal-antiferromagnet interfaces leads to a d-wave superconductive pairing, in contrast to the p-wave superconductivity mediated by magnons in ferromagnets.