Relaxation effects in the charge-ordered state of La${}_{0.5}$Ca${}_{0.5}$MnO${}_3$

Abstract

We report an experimental study of the time dependence of the resistivity and magnetization of charge-ordered La${}_{0.5}$Ca${}_{0.5}$MnO${}_3$ under different thermal and magnetic field conditions. A relaxation with a stretched exponential time dependence has been observed at temperatures below the charge ordering temperature. A model using a hierarchical distribution of relaxation times can explain the data.

4 pages LateX 3 figs. included