The temperature dependent local structure of Tb Mn2 O5 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 ∼180 K. The distributions sharpen below the Tb magnetic ordering temperature (∼10 K). The distortions in the Tb-O distribution, away from the Pbam structure, are consistent with rotations of the Mn Ox 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.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - May 8 2007|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics