# Odd-frequency Pairing in the Edge States of Superconducting Pnictides in the Coexistence Phase with Antiferromagnetism

## TL;DR

This paper demonstrates that odd-frequency spin-triplet superconductivity naturally occurs at the edges of pnictide superconductors coexisting with antiferromagnetism, offering a new platform for exploring this quantum phase.

## Contribution

It reveals the emergence of odd-frequency superconductivity on the edges of pnictides in the coexistence phase with antiferromagnetism, a phenomenon previously mainly sought in heterostructures.

## Key findings

- Odd-frequency pairing appears on the edges of pnictides with SDW and superconductivity.
- The odd-frequency pairing has even parity components, immune to disorder.
- Potential detection via magnetic response measurements.

## Abstract

In several members of the pnictide materials, spin density wave order coexists with superconductivity over a range of dopings and temperature. In this paper we show that odd-frequency superconductivity emerges on the edges of pnictides in such a coexistence phase. In particular, the breaking of spin-rotation symmetry by SDW and translation symmetry by the edge can lead to the development of odd-frequency spin-triplet Cooper pairing on edges of superconducting pnictide samples. In this case, the odd-frequency pairing has even parity components, which are immune to disorder. Our results show that pnictides are a natural platform to realize odd frequency superconductivity, which is a new quantum phase and has been mainly searched for in heterostructures of magnetic and superconducting materials. The emergence of odd-frequency pairing on the edges and in the defects can be potentially detected in magnetic response measurements.