Experimental evidence for stochastic switching of supercooled phases

Devendra Kumar, K. P. Rajeev, J. A. Alonso, M. J. Martínez-Lope

Published 2014-09-16Version 1

First-order phase transition in a highly correlated electron system can manifest as a dynamic phenomenon. The presence of multiple domains of the coexisting phases average out the dynamical effects making it nearly impossible to predict the exact nature of phase transition dynamics. Here we report the metal-insulator transition in samples of sub-micrometer size NdNiO3 where the effect of averaging is minimized by restricting the number of domains under study. We observe the presence of supercooled metallic phases with supercooling of 40 K or more. The transformation from supercooled metallic to insulating state is a stochastic process that happens at different temperature and time in different experimental runs. The experimental results are understood without incorporating material specific properties suggesting their universal nature. The size of the sample needed to observe individual switching of supercooled domains, the degree of supercooling, and the time-temperature window of switching is expected to depend on the parameters such as quenched disorder, strain, magnetic field etc.