# Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

## TL;DR

This study investigates the structural and electronic properties of the newly discovered ThFeAsN superconductor using neutron diffraction and transport measurements, revealing its electron-doped nature and absence of magnetic order.

## Contribution

It provides the first neutron diffraction analysis of ThFeAsN, showing structural distortion and electron doping effects that influence its superconducting properties.

## Key findings

- No magnetic transition observed.
- Weak structural distortion around 160 K.
- Behavior consistent with electron-doped pnictide superconductors.

## Abstract

We report neutron diffraction and transport results on the newly discovered superconducting nitride ThFeAsN with $T_c=$ 30 K. No magnetic transition, but a weak structural distortion around 160 K, is observed cooling from 300 K to 6 K. Analysis on the resistivity, Hall transport and crystal structure suggests this material behaves as an electron optimally doped pnictide superconductors due to extra electrons from nitrogen deficiency or oxygen occupancy at the nitrogen site, which together with the low arsenic height may enhance the electron itinerancy and reduce the electron correlations, thus suppress the static magnetic order.