Abstract
Present communication reports the possible origin of the colossal magnetodielectric (MD) effect observed at room temperature in La0.4Re0.1Ca0.5MnO3 (with Re = Eu, Gd, and Dy) polycrystalline manganites. This study reveals that all the samples are half–doped (% Mn3+ = % Mn4+ = 50 %) and room temperature X-ray absorption measurement at Mn L-edges confirms the presence of both Mn3+ and Mn4+ ions in these oxides. All these specimens are paramagnetic at room temperature with the presence of metastable charge–ordered domains. The application of a low constant magnetic field of 0.6 T and 1.2 T collapses some of the charge-ordered domains that lead to the charge delocalization and colossal values of the MD effect. The Dy–based sample exhibits the strongest charge ordering state, ascribed to the important cationic mismatch effect.
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