57Fe Mossbauer study of Lu2Fe3Si5 iron silicide superconductor

TL;DR

This study uses 57Fe Mossbauer spectroscopy to analyze the iron-based superconductor Lu2Fe3Si5 across a range of temperatures, revealing no abnormal hyperfine behavior near the superconducting transition.

Contribution

It provides detailed Mossbauer spectroscopic data on Lu2Fe3Si5, highlighting the absence of anomalies near Tc and estimating the Debye temperature from spectral parameters.

Findings

Spectra show two doublets consistent with two Fe sites.

No abnormal hyperfine behavior observed near Tc.

Debye temperature estimated from spectral data.

Abstract

With the advent of Fe-As based superconductivity it has become important to study how superconductivity manifests itself in details of 57Fe Mossbauer spectroscopy of conventional, Fe - bearing superconductors. To this end, the iron-based superconductor Lu2Fe3Si5 has been studied by 57Fe Mossbauer spectroscopy over the temperature range from 4.4 K to room temperature with particular attention to the region close to the superconducting transition temperature (Tc = 6.1 K). Consistent with the two crystallographic sites for Fe in this structure, the observed spectra appear to have a pattern consisting of two doublets over the whole temperature range. The value of Debye temperature was estimated from temperature dependence of the isomer shift and the total spectral area and compared with the specific heat capacity data. Neither abnormal behavior of the hyperfine parameters at or near Tc, nor phonon softening were observed.