Magnetism of BaFe2Se3 studied by M\"ossbauer spectroscopy

TL;DR

This study investigates the magnetic and valence state properties of BaFe2Se3 using Mössbauer spectroscopy, revealing mixed-valence iron states, multiple iron sites in magnetic order, and the presence of impurity phases including superconducting FeSe.

Contribution

It provides detailed insights into the valence states and magnetic structure of BaFe2Se3, including the identification of multiple iron sites and impurity phases, using temperature-dependent Mössbauer spectroscopy.

Findings

Mixed-valence state of iron in BaFe2Se3

At least four distinct iron sites in the magnetic state

Presence of impurity phases including superconducting FeSe

Abstract

The compound BaFe2Se3 (Pnma) has been synthesized in the form of single crystals with the average composition Ba0.992Fe1.998Se3. The Moessbauer spectroscopy used for investigation of the valence states of Fe in this compound at temperature ranging from 4.2 K till room temperature revealed the occurrence of mixed-valence state for iron. The spectrum is characterized by sharply defined electric quadrupole doublet above magnetic ordering at about 250 K. For the magnetically ordered state one sees four iron sites at least and each of them is described by separate axially symmetric electric field gradient tensor with the principal component making some angle with the hyperfine magnetic field. They form two groups occurring in equal abundances. It is likely that each group belongs to separate spin ladder with various tilts of the FeSe4 tetrahedral units along the ladder. Two impurity phases are found, i.e., superconducting FeSe and some other unidentified iron-bearing phase being magnetically disordered above 80 K. Powder form of BaFe2Se3 is unstable in contact with the air and decomposes slowly to this unidentified phase exhibiting almost the same quadrupole doublet as BaFe2Se3 above magnetic transition temperature.