Crossover from meta-magnetic state to spin-glass behaviour upon Ti-substitution for Mn in CuMn2O4

TL;DR

This study investigates how Ti-substitution in CuMn2O4 alters its magnetic state from meta-magnetic to spin-glass behavior, supported by neutron diffraction, spectroscopy, and magnetization data.

Contribution

It provides new insights into the magnetic phase transition induced by Ti-substitution in CuMn2O4, combining structural and magnetic analyses.

Findings

Meta-magnetic order below 76K transitions to spin-glass behavior with Ti-substitution.

Room temperature magnetic behavior shows weak ferromagnetism via Arrott's plot.

Dielectric properties are dominated by grain boundary effects, increasing with Ti-substitution.

Abstract

Tetragonal distorted spinel of CuMn2-xTixO4 (x = 0, 0.25 and 0.50) was prepared by solid state reaction method followed by neutron diffraction, FTIR spectroscopy, dielectric spectroscopy and magnetization measurements. The neutron diffraction and FTIR spectroscopy provide the information regarding phase formation. But, the magnetic susceptibility clearly shows the ferri-magnetic order below 76K associated with meta-magnetic state which turns to spin-glass behaviour upon Ti-substitution for Mn in CuMn2O4. In addition, the room temperature M(H) of all the spinels are described by the Arrott's plot for weak ferromagnetism. Further, the room temperature dielectric measurement provides the electronic property of CuMn2O4 dominated by grain boundary effect that is significantly increased upon Ti-substitution for Mn in CuMn2O4.