Local Structure of Multiferroic TbMn2O5: Evidence for an Anomalous Terbium Oxygen Distribution

Abstract

The temperature dependent local structure of TbMn2O5 was determined by x-ray absorption spectroscopy. An anomalous Tb-O distribution is found. At high temperature it is broad but resolves into two distinct peaks below approximately 180 K. The distributions sharpen below the Tb magnetic ordering temperature (approximately 10 K). The distortions in the Tb-O distribution, away from the Pbam structure, are consistent with rotations of the MnOx polyhedra about the c-axis and suggest that Tb-O bond polarization may play a significant role in the observed ferroelectric properties of this system.

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References in corpus (5)

• Physics of thin-film ferroelectric oxides
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• The ferroelectric transition in YMnO${}_3$ from first principles
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• Probing the role of Nd3+ ions in the weak multiferroic character of NdMn2O5 by optical spectroscopies
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