Variation of T$_g$ with magnetic field in a magnetic glass

Details Variation of T$_g$ with magnetic field in a magnetic glass Variation of T$_g$ with magnetic field in a magnetic glass

2009-04-17

arxiv.org/abs/0904.2635v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

Glass-like arrest has recently been reported in various magnetic materials. As in structural glasses, the kinetics of a first-order transformation is arrested while retaining the higher-entropy phase as a non-ergodic state. We show visual mesoscopic evidence of the irreversible devitrification of the arrested antiferromagnetic-insulating phase in $Pr_{0.5}Ca_{0.5}Mn_{0.975}Al_{0.025}O_3$ to its equilibrium ferromagnetic-metallic phase with isothermal increase of magnetic field, similar to its iso-field devitrification on warming. The slope of $T_g$ vs magnetic field in half-doped manganites is shown to have a sign governed by Le Chatelier's Principle.

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