Phase coexistence and associated non-equilibrium dynamics under simultaneously applied magnetic field and pressure

TL;DR

This study investigates how simultaneous application of pressure and magnetic field influences phase coexistence and non-equilibrium dynamics in manganite compounds, highlighting the role of phase interfaces in these processes.

Contribution

It provides a quantitative analysis of pressure and magnetic field effects on phase coexistence and non-equilibrium dynamics in specific manganite materials, emphasizing the importance of phase interfaces.

Findings

Pressure and magnetic field affect supercooling and superheating temperatures.

The volume fraction of phases is controlled by external conditions.

Phase interfaces are crucial in non-equilibrium dynamics.

Abstract

A quantitative estimation of the effect of simultaneously applied external pressure (P) and magnetic field (H) on the phase coexistence has been presented for Pr0.5Ca0.5Mn0.975Al0.025O3 and La0.5Ca0.5MnO3, where the ferromagnetic (FM)-metal and antiferromagnetic (AFM)-insulator phases compete in real space. We found that the nonequilibrium dynamics across the FM-AFM transition is primarily dictated by the effect of P and H on the supercooling, superheating temperatures, and the nucleation and growth rate of the equilibrium phase. These effects across the transition is also responsible for the relative volume fraction of the competing phases at low temperature. Importantly in the entire magnetic field-pressure-temperature range of phase coexistence, the interface between the two competing phases having different spin and structural order plays a very important role in controlling the non-equilibrium dynamics.