Pressure-induced structural distortion of TbMnO3: A combined x-ray diffraction and x-ray absorption spectroscopy study

被引：35

作者：

Chen, J. M. ^{[1
]}

Chou, T. L. ^{[1
]}

Lee, J. M. ^{[1
,2
]}

Chen, S. A. ^{[1
]}

Chan, T. S. ^{[1
]}

Chen, T. H. ^{[1
]}

Lu, K. T. ^{[1
]}

Chuang, W. T. ^{[1
]}

Sheu, H. -S. ^{[1
]}

Chen, S. W. ^{[1
]}

Lin, C. M. ^{[3
]}

Hiraoka, N. ^{[1
]}

Ishii, H. ^{[1
]}

Tsuei, K. D. ^{[1
]}

Yang, T. J. ^{[2
]}

机构：

[1] Natl Synchrotron Radiat Res Ctr NSRRC, Hsinchu 30076, Taiwan

[2] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan

[3] Natl Hsinchu Univ Educ, Dept Appl Sci, Hsinchu 30014, Taiwan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 16期

关键词：

electronic structure; high-pressure effects; Jahn-Teller effect; multiferroics; solid-state phase transformations; terbium compounds; X-ray absorption spectra; X-ray diffraction; MANGANITES; SCATTERING; MAGNETORESISTANCE; RESISTIVITY;

D O I：

10.1103/PhysRevB.79.165110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The variation of electronic states and structural distortion in highly compressed multiferroic TbMnO3 was probed by x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS) using synchrotron radiation. Refined XRD data enabled observation of a reduced local Jahn-Teller (JT) distortion of Mn sites within MnO6 octahedra in TbMnO3 with increasing hydrostatic pressure. A progressively increasing intensity of the white line in Mn K-edge x-ray absorption spectra of TbMnO3 was detected with increasing pressure. The absorption threshold of Mn K-edge spectra of TbMnO3 is shifted toward higher energy, whereas the pre-edge peak is slightly shifted to lower energy with increasing hydrostatic pressure. We provide spectral evidence for pressure-induced bandwidth broadening for mangnites. The enhanced intensity of the white line and the shifted absorption threshold of Mn K-edge spectra are explained in terms of a reduced JT distortion of MnO6 octahedra in compressed TbMnO3. Comparison of XAS data with full-multiple-scattering calculations using code FDMNES shows satisfactory agreement between experimental and calculated Mn K-edge spectra.

引用

页数：7

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