Magneto-Dielectric Behavior in $L{a}_{0.53}C{a}_{0.47}Mn{O}_3$

Abstract

We prospect magneto-dielectricity in $L{a}_{0.53}C{a}_{0.47}Mn{O}_3$ across its paramagnetic (PMI) to ferromagnetic (FMM) isostructural transition at $T_C\sim 253K$, by magnetic ($(M)$), caloric ($(W)$), dielectric ($({\epsilon }^{\prime })$), magneto-resistive (MR), and magneto-capacitance (MC) investigations. Skew-broadened first-order transition character is confirmed via heating/cooling hystereses in $(M)(T)$ and $(W)(T)$, with superheating temperature $T\ast \ast$ almost next to $T_C$ and supercooling temperature $T\ast$ exhibiting kinetics. Above $T_C$, linearly-related MC and MR reflect purely magneto-resistance effect. Near $T_C$, the high-frequency MC(5T) much exceeds the magneto-losses, and is uncorrelated with dc MR(5T) in the FM-ordered state. The intrinsic magneto-dielectricity manifest below $T_C$ and above ~kHz is traced to an intra-granular Maxwell-Wagner-type effect at the interface-region of PMI-FMM phase-coexistence.

16 pages, 5 figures, and 39 references

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• Magnetodielectric coupling in Mn3O4
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• Investigation of charge states and multiferroicity in Fe-doped h-YMnO3
• Dielectric anomaly at the orbital order-disorder transition in LaMnO_(3+delta)
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