2012 Fiscal Year Final Research Report
Development of electron resonance inelastic scattering and its application to orbital order analysis of perovskite manganese oxides
| 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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| 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 |
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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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