A M\"ossbauer study of the magneto-structural coupling effect in SrFe$_2$As$_2$ and SrFeAsF

TL;DR

This study uses Mössbauer spectroscopy to compare the magnetic and structural coupling in SrFe$_2$As$_2$ and SrFeAsF, revealing differences in magnetic moments and coupling effects linked to their inter-layer properties.

Contribution

It provides the first comparative analysis of these compounds' magneto-structural coupling using Mössbauer spectroscopy and a modified Bean-Rodbell model.

Findings

SrFeAsF exhibits a smaller magnetic moment.

The magneto-structural coupling is weaker in SrFeAsF.

Differences are attributed to inter-layer property variations.

Abstract

In the present paper, we report a comparison study of SrFe$_2$As$_2$ and SrFeAsF using M\"ossbauer spectroscopy. The temperature dependence of the magnetic hyperfine field is fitted with a modified Bean-Rodbell model. The results give much smaller magnetic moment and magneto-structural coupling effect for SrFeAsF, which may be understood as due to different inter-layer properties of the two compounds.