2015 Fiscal Year Final Research Report
Mechanism of a simultaneous metal-insulator and spin-state transition in Pr-Ca-Co-O system
| Project/Area Number |
24540355
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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 II
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| Research Institution | Iwate University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
FUJISHIRO HIROYUKI 岩手大学, 工学部, 教授 (90199315)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Keywords | コバルト酸化物 / 金属絶縁体転移 / スピン状態転移 / 磁場効果 |
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| Outline of Final Research Achievements |
A spin-state (SS) transition of trivalent Co ion occurs simultaneously metal-insulator (MI) transition in Pr-Ca-Co-O system. The motivation of this study is to clarify the mechanism of this MI-SS transition. The obtained important results are listed below. 1) the valence change of Pr ion from 3+ to 4+ on cooling, which was observed by the X-ray absorption spectroscopy at SPring-8, induced the transition. In addition, the valence of Tb ion also changed at the transition. 2) The MI-SS transition was fully suppressed by a strong magnetic field, in which the valence change of Pr ion was induced by the magnetic field.
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| Free Research Field |
低温物理学
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