Field induced magnetic transition and metastability in Co substituted $M{n}_{2}Sb$

Abstract

A detailed investigation of first order ferrimagnetic (FRI) to antiferromagnetic (AFM) transition in Co (15%) doped $M{n}_{2}Sb$ 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.

10 pages, 8 figures

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• Relating supercooling and glass-like arrest of kinetics for phase separated systems: studies on doped CeFe${}_2$ and (La,Pr,Ca)MnO${}_3$
• Anomalous First Order Transition in $Nd{}_{0.5}Sr{}_{0.5}MnO{}_3$: An interplay between kinetic arrest and thermodynamic transitions
• Coexisting tuneable fractions of glassy and equilibrium long-range-order phases in manganites
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