Pressure and Temperature Dependence of Local Structure and Electronic Structure of Orthorhombic DyMnO
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概要
- 論文の詳細を見る
The dependence on pressure and temperature of the local structure and electronic state for MnO<inf>6</inf>octahedra in orthorhombic DyMnO<inf>3</inf>is investigated with Raman scattering, lifetime-broadening-suppressed x-ray absorption spectra and x-ray emission spectra. With increasing pressure, all Raman-active modes of DyMnO<inf>3</inf>persist and shift monotonically to greater wavenumbers, implying that no structural change occurs under an external pressure up to {\sim}32 GPa. The spectral weight of the white line in Mn K-edge x-ray absorption spectra of DyMnO<inf>3</inf>increased progressively, whereas the pre-edge feature gradually shifted to smaller energy upon increasing pressure. The Jahn--Teller distortion of MnO<inf>6</inf>octahedra in DyMnO<inf>3</inf>is progressively diminished with increasing pressure. The energy of the pre-edge line increased upon cooling from 300 to 10 K, in contrast with the pressure effect. A gradual breakdown of the high-spin state for MnO<inf>6</inf>octahedra in DyMnO<inf>3</inf>is observed. This work provides insight into structural modifications in highly distorted perovskite manganites under pressure and temperature.
- 2013-06-15
著者
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CHEN Jin-Ming
National Synchrotron Radiation Research Center (NSRRC)
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Lin Chih-Ming
Department of Applied Science, National Taitung University, Taitung 950, Taiwan
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Chen Shin-An
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Chen Jin-Ming
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Haw Shu-Chih
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Chou Ta-Lei
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Lee Jenn-Min
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Huang Eugene
Center for General Education, Chung Chou Institute of Technology, Changhua County 510, Taiwan, R.O.C.
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Lu Kueih-Tzu
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Chen Shi-Wei
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Deng Ming-Jay
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Ishii Hirofumi
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Hiraoka Nozomu
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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Tsuei Ku-Ding
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C.
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