# Spectroscopic evidence of odd frequency superconducting order

## TL;DR

This paper presents spectroscopic evidence indicating the presence of odd frequency superconducting order in spin filter superconducting tunnel junctions, highlighting a conductance peak as a signature of unconventional superconductivity.

## Contribution

It provides experimental spectroscopic evidence for odd frequency superconductivity in NbN/GdN/TiN junctions, a novel observation in this context.

## Key findings

- Zero bias conductance peak observed at low temperatures
- Peak magnitude exceeds normal state conductance
- Signature of unconventional, odd frequency superconductivity

## Abstract

Spin filter superconducting S/I/N tunnel junctions (NbN/GdN/TiN) show a robust and pronounced zero bias conductance peak at low temperatures, the magnitude of which is several times the normal state conductance of the junction. Such a conductance anomaly is representative of unconventional superconductivity and is interpreted as a direct signature of an odd frequency superconducting order.

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Source: https://tomesphere.com/paper/1702.00010