| Project/Area Number |
23654117
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nagoya University |
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Principal Investigator |
SAITOH Koh 名古屋大学, エコトピア科学研究所, 准教授 (50292280)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | 強相関系 / 電荷・軌道秩序 / ペロブスカイトMn酸化物 / 電子線非弾性散乱 / 電子エネルギー損失分光 / 電子線 / 非弾性散乱 / 内殻電子励起 / 軌道秩序 / 遷移金属酸化物 / 電子顕微鏡 |
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| Research Abstract |
The present research study is aimed to develop a method to analyze the orbital order of d-electrons in strongly-correlated electron systems by inelastic scattering accompanied by inner-shell excitation and to apply the method to Mn-perovskite oxides, which show a variety of electronic properties such as high-temperature superconductivity, giant magnetoresistivity, etc. The following results are obtained. (1)The space group of Nd0.5Sr0.5MnO3is determined to be Pmnmby convergent-beam electron diffraction. (2)The hole state of Nd0.5Sr0.5MnO3shows significant anisotropy in inelastic scattering patterns accompanied by Mn-Lshell excitation. Two kinds of anisotropies are observed, one of which is consistent to the CE type orbital-order model, whereas the other is inconsistent to the model. A new model of the orbital order is proposed on the basis of the space group of Pmnmand the inelastic scattering anisotropy.
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