Role of t{sub 2g} electrons in Mn-Tb coupling of multiferroic TbMnO{sub 3}
- College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003 (China)
- College of Science, Civil Aviation University of China, Tianjin 300300 (China)
We investigate the effect of Cr-doping in polycrystalline TbMn{sub 1−x}Cr{sub x}O{sub 3} (x ≤ 6%) ceramics on the magnetism, ferroelectricity, and dielectricity. The Cr substitution gradually suppresses the ferroelectricity induced by the Mn spiral spin ordering, and results in a stronger modulation of polarization by magnetic field with increasing x. However, the transition temperature T{sub Tb} corresponding to onset of Tb magnetic ordering has barely shifted with Cr doping. In other words, although the Cr-doping obviously disrupts the Mn spiral spin ordering, the exchange field J{sub Mn-Tb} acting on the Tb moments from the Mn-spin structure is hardly impacted. Our work demonstrates that the e{sub g} electron of Mn{sup 3+} plays an important role in forming the Mn spiral spin order, but the f-d exchange interaction between the Mn 3d spins and the Tb 4f moments in multiferroic TbMnO{sub 3} almost involves only the t{sub 2g} electrons.
- OSTI ID:
- 22314613
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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