Relaxations as key to the magnetocapacitive effects in the perovskite manganites - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: We present a detailed dielectric study of the relaxation effects that occurin several perovskite rare-earth manganites, including the multiferroics TbMnO3and DyMnO3. We demonstrate that the strong magnetocapacitive effects, observedfor electrical fields E||c, are nearly completely governed by magnetic-stateinduced changes of the relaxation parameters. The multiferroic materials, whichundergo a transition into a spiral magnetic state, show qualitatively differentrelaxation behavior than those compounds transferring into an A-typeantiferromagnetic state. We ascribe the relaxations in both cases to theoff-center motion of the manganese ions, which in the multiferroic systems alsoleads to the ferroelectric ordering.



Author: F. Schrettle, P. Lunkenheimer, J. Hemberger, V. Yu. Ivanov, A. A. Mukhin, A. M. Balbashov, A. Loidl

Source: https://arxiv.org/







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