# Enhancement of superconductivity mediated by antiferromagnetic squeezed magnons

## TL;DR

This paper theoretically explores how coupling a normal metal to a two-sublattice antiferromagnetic insulator can significantly enhance magnon-mediated p-wave superconductivity, especially via sublattice asymmetry and squeezed magnon modes.

## Contribution

It introduces a novel mechanism for increasing superconducting critical temperature by exploiting sublattice asymmetry and squeezed magnon modes in antiferromagnetic heterostructures.

## Key findings

- Critical temperature can be increased from near zero to above 1 K.
- Sublattice asymmetry enhances the magnon-mediated pairing.
- Squeezed magnon eigenmodes underpin the enhancement mechanism.

## Abstract

We investigate theoretically magnon-mediated superconductivity in a heterostructure consisting of a normal metal and a two-sublattice antiferromagnetic insulator. The attractive electron-electron pairing interaction is caused by an interfacial exchange coupling with magnons residing in the antiferromagnet, resulting in p-wave, spin-triplet superconductivity in the normal metal. Our main finding is that one may significantly enhance the superconducting critical temperature by coupling the normal metal to only one of the two antiferromagnetic sublattices employing, for example, an uncompensated interface. Employing realistic material parameters, the critical temperature increases from vanishingly small values to values significantly larger than 1 K as the interfacial coupling becomes strongly sublattice-asymmetric. We provide a general physical picture of this enhancement mechanism based on the notion of squeezed bosonic eigenmodes.