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Title: Role of t{sub 2g} electrons in Mn-Tb coupling of multiferroic TbMnO{sub 3}

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.
Authors:
 [1] ; ;  [2] ;  [3]
  1. College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003 (China)
  2. Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
  3. College of Science, Civil Aviation University of China, Tianjin 300300 (China)
Publication Date:
OSTI Identifier:
22314613
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CERAMICS; ELECTRONS; EXCHANGE INTERACTIONS; MAGNETIC FIELDS; MAGNETISM; MAGNETIZATION; MANGANESE IONS; POLARIZATION; POLYCRYSTALS; SPIN; TRANSITION TEMPERATURE