Effect of strain on phase separation and de-vitrification of magnetic glass state in thin films of La5/8-yPryCa3/8MnO3 (y=0.45)

Abstract

We present our study of effect of substrate induced strain on the La5/8-yPryCa3/8MnO3 (y=0.45), thin films grown on LaAlO3, NdGaO3 and SrTiO3 susbtrates that show large scale phase separation. It is observed that unstrained films grown on NdGaO3 behave quite similar to bulk material but the strained film grown on SrTiO3 show melting of insulating phase to metallic phase at low temperatures. However, the large scale phase separation and metastable glass-like state is observed in all the films despite difference in substrate induced strain. The measurements of resistivity as a function of temperature under cooling and heating in unequal field (CHUF) protocol elucidates the presence of glass-like meta-stable phase generated due to kinetic arrest of first order transformation in all the films. Like structural glasses, these magnetic glass-like phase shows evidence of devitrification of the arrested charge order-antiferromagnetic insulator (CO-AFI) phase to equilibrium ferromagnetic metallic (FMM) phase with isothermal increase of magnetic field and/or iso-field warming. These measurements also clearly brought out the equilibrium ground state of this system to be FMM and metastable glass-like phase to be AFI phase.

9 pages, 6 figures

References in corpus (8)

• Relating supercooling and glass-like arrest of kinetics for phase separated systems: studies on doped CeFe${}_2$ and (La,Pr,Ca)MnO${}_3$
• Coexisting tuneable fractions of glassy and equilibrium long-range-order phases in manganites
• Field induced magnetic transition and metastability in Co substituted $M{n}_{2}Sb$
• Conversion of glassy antiferromagnetic-insulating phase to equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$
• Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites
• Excess specific heat and evidence of zero point entropy in magnetic glassy state of half-doped manganites
• Real Space Visualization of Thermomagnetic Irreversibility within Supercooling and Superheating Spinodals in $M{n}_{1.85}C{o}_{0.15}Sb$ using Scanning Hall Probe Microscopy
• Complementarity of perturbations driving insulator-to-metal transition in a charge ordered manganite