Magnetic and dielectric investigations of $\gamma$ - Fe${_2}$WO${_6}$

TL;DR

This study investigates the magnetic, thermodynamic, and dielectric properties of the $ ext{Fe}_2 ext{WO}_6$ polymorph, revealing multiple magnetic transitions, magneto-dielectric coupling, and a glass-like magnetic ground state influenced by oxygen non-stoichiometry.

Contribution

It provides new insights into the magnetic and dielectric behavior of $ ext{Fe}_2 ext{WO}_6$, highlighting the effects of oxygen non-stoichiometry on its ground state and coupling phenomena.

Findings

Multiple magnetic transitions observed

Finite magneto-dielectric coupling detected

Magnetic ground state exhibits glass-like behavior

Abstract

The magnetic, thermodynamic and dielectric properties of the $\gamma$ - Fe${_2}$WO${_6}$ system is reported. Crystallizing in the centrosymmetric $Pbcn$ space group, this particular polymorph exhibits a number of different magnetic transitions, all of which are seen to exhibit a finite magneto-dielectric coupling. At the lowest measured temperatures, the magnetic ground state appears to be glass-like, as evidenced by the waiting time dependence of the magnetic relaxation. Also reflected in the frequency dependent dielectric measurements, these signatures possibly arise as a consequence of the oxygen non-stoichiometry, which promotes an inhomogeneous magnetic and electronic ground state.