Abstract
We present time-dependent behavior of the transport and magnetic properties in electron-doped manganites. The relaxation of the electrical resistivity $(\ensuremath{\rho})$ shows a clear correlation with the microscopic properties of the samples observed through transmission electron microscopy. Two different relaxation mechanisms could be distinguished in ${\text{La}}_{0.23}{\text{Ca}}_{0.77}{\text{MnO}}_{3}$. One of them was found to be common to different electron-doped manganites and is associated with a defective formation of the charge-order (CO) phase. The second one is the result of the coexistence of the CO phase with a secondary charge-disordered (CD) phase. In this case, a low-temperature boundary between static and dynamic phase-separation regimes is determined by the appearance of a small ferromagnetic moment associated with the CD volume. These results show that kinematic constraints and magnetoelastic interactions are key ingredients for a proper understanding of phase-separated manganites.
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