The controlling of electron orbital and its dependence on spin ordering of Mn thin films
| Project/Area Number |
13640356
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性II(磁性・金属・低温)
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| Research Institution | The University of Tokyo |
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Principal Investigator |
IZUMI Makoto Research Center for Advanced Science and Technology, Lecturer, 先端科学技術研究センター, 講師 (80332576)
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| Co-Investigator(Kenkyū-buntansha) |
MURAKAMI Yoichi Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (60190899)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Oxide thin film / Colossal magnetoresistance / orbital ordering / Resonant x-ray scattering / Jahn-Teller distortion |
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| Research Abstract |
We have fabricated the perovskite-type thin film by the Pulsed laser deposition method. We fixed the substrate as SrTiO_3, and, varied R (trivalent cation) of R_<1-x>Sr_xMnO_3 (x=0.4) from La, Pr, and Nd and its solid solutions. In-plane lattice parameters were fixed as same as that of substrate because of substrate strain and only c-axis length could be changed controllably by changed averaged ionic size of <R_<1-x>Sr_x>. This result means we can control only crystal field, and actually, we can obtain another phase diagram from the bulk crystal. In other words, we succeeded the lattice parameter without change the doping level. There is a crossover if A site cation site is smaller than Pr, the crystal shows the layered type AF spin ordering though FM in the bulk, larger, FM as same as bulk.
In the experimental of resonant x-ray scattering, results show anomalous diffraction comes from the mainly Jahn-Teller distortion, probably more than 80%, though until now anisotropy of Tensor of scattering factor is believed to arise from charge repulsion between 3d-4p electron
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Report
(3 results)
Research Products
(33 results)
