標題: Intra- and intersite electronic excitations in multiferroic TbMnO3 probed by resonant inelastic x-ray scattering
作者: Chen, J. M.
Lee, J. M.
Huang, S. W.
Lu, K. T.
Jeng, H. T.
Chen, C. K.
Haw, S. C.
Chou, T. L.
Chen, S. A.
Hiraoka, N.
Ishii, H.
Tsuei, K. D.
Yang, T. J.
電子物理學系
Department of Electrophysics
公開日期: 27-Sep-2010
摘要: Mn 3d valence states and elementary electronic excitations in single-crystalline TbMnO3 were probed with resonant inelastic x-ray scattering (RIXS) (or resonant x-ray emission spectroscopy, RXES), polarized x-ray absorption spectra and ab initio electron-structure calculations. Polarized Mn K-edge x-ray absorption spectra of TbMnO3 crystals exhibit a significant anisotropy along three crystallographic directions, particularly for the white-line region. The 1s3p-RXES spectra obtained at the Mn K edge reveal that the quadrupolar Raman regime is restricted predominantly to below the pre-edge peak whereas the fluorescence regime starts from the first pre-edge peak of 1s -> 3d transitions, indicating a relatively delocalized character of unoccupied Mn 3d states. The additional K beta emission profile at energy loss similar to 62 eV is attributed to the off-site dipole Mn 1s-Mn' 3d and/or Mn 1s-Tb 5d transitions, originating from hybridization between Mn 4p states and neighboring Mn' 3d/Tb 5d states. The off-site dipole transition makes a considerable contribution to the pre-edge region of Mn K-edge spectrum. Three prominent RIXS features at similar to 2.9, 7, and 11 eV were observed. Based on GGA+U calculations, the 7 eV region corresponds to transitions from O 2p states to unoccupied minority Mn 3d states, whereas the 11 eV band is ascribed to transitions from the O 2p band to the empty Tb 5d band. The broad 2.9 eV band is attributed to the coexistence of on-site Mn 3d-Mn 3d and off-site Mn 3d-Mn' 3d transitions.
URI: http://dx.doi.org/10.1103/PhysRevB.82.094442
http://hdl.handle.net/11536/150045
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.82.094442
期刊: PHYSICAL REVIEW B
Volume: 82
Issue: 9
起始頁: 0
結束頁: 0
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