Spin-crossover in the cobalt oxides from a microscopic viewpoint and its field effects
| Project/Area Number |
16K05443
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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 | Nagoya Institute of Technology |
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Principal Investigator |
Asaka Toru 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (80525973)
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| Co-Investigator(Kenkyū-buntansha) |
阿部 伸行 東京大学, 大学院新領域創成科学研究科, 助教 (70582005)
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| Research Collaborator |
ARIMA Taka-hisa
KOSHIHARA Shinya
OKIMOTO Yoichi
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | スピンクロスオーバー / 遷移金属酸化物 / 構造解析 / 磁性 / 強相関系 |
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| Outline of Final Research Achievements |
The Correlations between physical properties and crystal structures in the complex cobalt oxides were investigated to understand the spin-crossover phenomenon. The spin state of intermediate temperature phase in typical spin-crossover compound lanthanum cobaltate was discussed by means of the structure analyses. The spin states in some of cobalt oxides were successfully transformed by controlling of the crystal structures. Furthermore, the external field effect, such as light and pressure, on the spin-crossover phenomena was also examined in the aspects of crystal structures and textures.
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| Academic Significance and Societal Importance of the Research Achievements |
遷移金属イオンの一部は同一の価数ながら電子軌道を異にする状態（スピン状態）を取りうることがある。遷移金属錯体などではスピン状態の変化により磁性や電気的性質、色などが変化することが知られている。スピン状態が熱や圧力、光などにより変化することをスピンクロスオーバーというが、本研究ではスピンクロスオーバーを示す複合コバルト酸化物について物性と結晶構造の相関について調べ、スピンクロスオーバーにより引き起こされる構造相転移など遷移金属酸化物特有の現象を見出した。
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Report
(4 results)
Research Products
(29 results)
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[Presentation] Structural dynamics of EuBaCo2O5.38 by ultlafast time resolved electron diffraction2017
Author(s)
N. Keio, H. Murakami, M. Hada, T. Nishikawa, Y.Yamashita, T.Yokoya, J. Matsuo, T.Asaka, T. Suzuki, N.Abe, T.-H. Arima, A. Ozawa, Y. Okimoto, S. Koshihara
Organizer
Current trends in Optical and X-Ray metrologies of key enabling nanomaterials/devices for the Ubiquitous Society, renewable energy and health (OptoX NANO)
Related Report
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[Presentation] 時間分解電子線回折法を用いたEuBaCo2O5.38の構造ダイナミクス計測2017
Author(s)
羽田真毅, 慶尾直哉, 村上寛虎, 西川亘, 山下善文, 林靖彦, 横谷尚睦, 松尾二郎, 浅香透, 鈴木達也, 阿部伸行, 有馬孝尚, 沖本洋一, 腰原伸也
Organizer
日本物理学会 2017年秋季大会
Related Report
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[Presentation] Correlation among Structure, Magnetism and Electron Transport due to Successive Charge Ordering Transition in GdBaFe2O52017
Author(s)
T. Matsumura, D. Urushihara, T. Asaka, K. Fukuda, S. Konishi, K. Tanaka, T. Abe, D. Tsuru, C. Moriyoshi, Y. Kuroiwa
Organizer
International Union of Materials Research Societies-The 15th International Conference on Advanced Materials 2017
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