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

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

2007-02-27

arxiv.org/abs/cond-mat/0702621v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 Figures

Scientific paper

10.1103/PhysRevB.75.174413

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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