Field induced magnetic transition and metastability in Co substituted $Mn_{2}Sb$

TL;DR

This study investigates the magnetic phase transitions and metastability in Co-doped Mn2Sb, revealing anomalous irreversibility, glass-like phases, and reentrant transitions driven by magnetic field and temperature variations.

Contribution

It provides new insights into the kinetic arrest and supercooling phenomena in Co-doped Mn2Sb, distinguishing different sources of irreversibility and demonstrating reentrant magnetic transitions.

Findings

Observation of anomalous thermomagnetic irreversibility.

Identification of glass-like frozen FRI phase at low temperatures.

Reentrant FRI-AFM-FRI transition with increasing temperature.

Abstract

A detailed investigation of first order ferrimagnetic (FRI) to antiferromagnetic (AFM) transition in Co (15%) doped $Mn_2Sb$ is carried out. These measurements demonstrate anomalous thermomagnetic irreversibility and glass-like frozen FRI phase at low temperatures. The irreversibility arising between the supercooling and superheating spinodals is distinguised in an ingenious way from the irreversibility arising due to kinetic arrest. Field annealing measurements shows reentrant FRI-AFM-FRI transition with increasing temperature. These measurements also show that kinetic arrest band and supercooling band are anitcorrelated i.e regions which are kinetically arrested at higher temperature have lower supercooling temperature and vice versa.