Abstract
We report studies on a magnetic glass formed by the arrest of the ferromagnetic-metallic to antiferromagnetic-insulating transition in a manganite around half doping, ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3}$. The observed glass-to-crystal conversion rate varies drastically and nonmonotonically with temperature; this variation is qualitatively consistent with what we predict by phenomenology. We also show that both homogeneous and heterogeneous nucleation can be obtained in the same sample under different annealing conditions. This gives rise to a gigantic change in resistivity without application of any magnetic field.
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