Investigation into giant magnetoresistance in molecular conductor by resonant x-ray scattering
| Project/Area Number |
24340084
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial 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 | Osaka University |
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Principal Investigator |
Hanasaki Noriaki 大阪大学, 理学(系)研究科(研究院), 教授 (70292761)
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| Co-Investigator(Kenkyū-buntansha) |
NOGAMI Yoshio 岡山大学, 大学院自然科学研究科, 教授 (10202251)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
Fiscal Year 2014: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Keywords | 強相関電子系 / 巨大磁気抵抗 / 電荷秩序 / 分子性伝導体 / フタロシアニン / 共鳴X線散乱 / ラマン散乱 |
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| Outline of Final Research Achievements |
In this study, we investigated the mechanism of the giant magnetoresistance observed in the phthalocyanine (Pc) molecular conductor. We found that the x-ray absorption spectra are sensiive to the Pc molecular charge just above the Fe K edge, and tried to detect the charge order of the pi conduction electron by measuring the resonant x-ray scattering. We found that the intramolecular interaction between the pi conduction electron and the d local moment is a ferromagnetic one, which is larger than 500K. This indicates that the magnetic order of the local moments controls the stability of the charge order in the pi conduction electron system. We reduced the density of the local moments by substituting with the Co atom, and observed the giant magnetoresistance in the low spin density. This giant magnetoresistance cannot be explained by the conventional model such as the manganese oxides, indicating the nontrivial electronic state.
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Report
(5 results)
Research Products
(52 results)
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[Journal Article] Observation of all-in type tetrahedral displacements in nonmagnetic pyrochlore niobates2016
Author(s)
S. Torigoe, Y. Ishimoto, Y. Aoishi, H. Murakawa, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata, K. Kodama, K. Tomiyasu, K. Ikeda, H. Nakao, Y. Nogami, N. Ikeda, T. Otomo, and N. Hanasaki
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Journal Title
Phys. Rev. B
Volume: 93
Issue: 8
Pages: 085109-085109
DOI
Related Report
Peer Reviewed
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[Journal Article] Bistable Multifunctionality and Switchable Strong Ferromagnetic-to-Anti ferromagnetic Coupling in a One-Dimen sional Rhodium(I)-Semiquinonato Complex2014
Author(s)
Mitsumi M., Nishitani T., Yamasaki S., Shimada N., Komatsu Y., Toriumi K., Kitagawa Y., Okumura M., Miyazaki Y., Gorska N., Inaba A., Kanda A., Hanasaki N
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Journal Title
J. Am. Chem. Soc
Volume: 136
Issue: 19
Pages: 7026-7037
DOI
Related Report
Peer Reviewed
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[Journal Article] XANES analysis of Phthalocyanine molecular conductor2012
Author(s)
K.Takahashi, T.Konishi, T.Fujikawa, N.Hanasaki, N.Kawamura, M.Mizumaki, M.Matsuda, D.E.C.Yu, T.Naito, T.Inabe, and H.Tajima
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Journal Title
e-Journal of Surface Science and Nanotechnology
Volume: 10
Pages: 92-96
NAID
Related Report
Peer Reviewed
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[Presentation] Nb Tetrahedaral Displacement in Pyrochlore Niobates2015
Author(s)
S.Torigoe, Y.Ishimoto, Y.Aoishi, H.Murakawa, D.Matsumura, K.Yoshii, Y.Yoneda, Y.Nishihata, K.Kodama, K.Tomiyasu, K.Ikeda, H.Nakao, T.Otomo, N.Ikeda, Y.Nogami, and N.Hanasaki
Organizer
The 2nd International Symposium of Interactive Material Science Cadet Program
Place of Presentation
Senri Hankyu Hotel
Year and Date
2015-11-18
Related Report
Int'l Joint Research
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