2014 Fiscal Year Final Research Report
Observation of the valence-band anisotropy of perovskite dielectrics under applied electric field probed by X-ray emission spectroscopy
| Project/Area Number |
24540325
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Hiroshima University |
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Principal Investigator |
NAKAJIMA Nobuo 広島大学, 理学(系)研究科(研究院), 准教授 (90302017)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | ペロブスカイト型チタン酸化物 / 電荷移動励起 / 誘電分極 / 共鳴Ｘ線発光分光 |
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| Outline of Final Research Achievements |
Ti K resonant X-ray emission spectra of SrTiO3 in quantum paraelectric phase were measured. It was that charge transfer excitation peaks were influenced by temperature decrease and UV irradiation. It can be a direct evidence that the electric dipole moment is derived from Ti off-center displacement in an oxygen otcahedon. The UV-assisted dipole moments were aligned parallel to the static electric field, as is evidenved from the additional change of the CT peak. We conclude that a local polar region formed by UV irradiation evolves under DC field application at low temperature.
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| Free Research Field |
光物性、誘電体物理
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