Magnetic and Hyperfine interactions in HoFe1-xCrxO3 compounds

TL;DR

This study investigates how substituting Cr for Fe in HoFe1-xCrxO3 compounds affects their magnetic and hyperfine properties, revealing changes in magnetic transition temperatures and hyperfine interactions due to structural and electronic modifications.

Contribution

It provides new insights into the magnetic and hyperfine behavior of HoFe1-xCrxO3 compounds with varying Cr content, highlighting the effects of Cr substitution on magnetic interactions and hyperfine parameters.

Findings

Neel temperature decreases with Cr substitution.

Spin re-orientation temperature increases with Cr substitution.

Hyperfine interactions are modified by Cr addition.

Abstract

We report on the magnetic and Mossbauer properties of polycrystalline HoFe1-xCrxO3 compounds. Magnetization data reveals the continuous tailoring of magnetic transition due to weakening of Ho3+ Fe3+ and Fe3+ Fe3+ interactions in the entire temperature range by replacing the Fe3+ ions with Cr3+ ions. The observed decrease in Neel temperature (TN) and increase in spin re-orientation transition temperature (TSR) with the replacement of Fe3+ with Cr3+ is ascribed to the weakening of Fe(Cr) O Fe(Cr) antiferromagnetic exchange interaction. In addition, we also attribute such a change in TN to the enhancement of ferromagnetic interaction of adjacent Cr3+ moments through t e hybridization as a result of the structural distortion. The decrease in isomer shift (IS) suggests enhancement of the interaction between nuclear charge with the 3s electrons as a result of decrease in radial part of 3d wave function with Cr addition. In this paper we also discuss about the variation of quadrupole splitting (QS) and hyperfine fields (Hhf) with Cr addition in HoFe1-xCrxO3 compounds.