Open AccessBonding anisotropy in multiferroic TbMnO3 probed by polarization dependent x-ray absorption spectroscopy
Author(s) -
J. M. Chen,
Jenn-Min Lee,
C. K. Chen,
TaLei Chou,
K. T. Lu,
ShuChih Haw,
Kevin Liang,
C. T. Chen,
HorngTay Jeng,
ShihWen Huang,
T. J. Yang,
Chien-Chang Shen,
RuShi Liu,
J.Y. Lin,
Zhiwei Hu
Publication year - 2009
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.3064126
Subject(s) - orthorhombic crystal system , multiferroics , zigzag , condensed matter physics , anisotropy , materials science , superlattice , absorption spectroscopy , polarization (electrochemistry) , manganite , tetragonal crystal system , magnetic anisotropy , ground state , spectral line , crystallography , magnetization , ferromagnetism , chemistry , crystal structure , optics , ferroelectricity , physics , atomic physics , optoelectronics , magnetic field , dielectric , mathematics , geometry , quantum mechanics , astronomy
O K- and Mn L2,3-edges x-ray absorption spectra of orthorhombic TbMnO3 single crystals show strong polarization dependence, in contrast with results of previous experiments on orthorhombic LaMnO3 and DyMnO3 thin films that show nearly isotropic spectral structure. First-principles calculations reveal that TbMnO3 exhibits a zigzag eg orbital ordering ground state. The highly distorted MnO6 octahedron and orbital ordering in TbMnO3 produce highly anisotropic Mn–O bonding within the ab plane, a frustration of the magnetic ordering, and the formation of complicated incommensurate magnetic structures.
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