2010 Fiscal Year Final Research Report
The study of novel quantum phenomena caused from the competition among multiple ground states in vanadium oxides
| Project/Area Number |
18104008
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
UEDA Yutaka The University of Tokyo, 物性研究所, 教授 (20127054)
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| Co-Investigator(Kenkyū-buntansha) |
UEDA Hiroaki 東京大学, 物性研究所, 助教 (10373276)
ISOBE Masahiko 東京大学, 物性研究所, 技術専門職員 (70396919)
ITOH Masayuki 名古屋大学, 理学研究科, 教授 (90176363)
TAKESHITA Nao 独立行政法人産業技術総合研究所, 研究員 (60292760)
YAMAUCHI Touru 東京大学, 物性研究所, 技術専門職員 (10422445)
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| Project Period (FY) |
2006 – 2010
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| Keywords | 強相関係 |
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| Research Abstract |
Inβ-vanadium bronzes, we found the competition among a rich variety of electronic states such as charge disordered metallic phases, charge ordered antiferromagnetic insulator phases, charge ordered spin-gapped insulator phases and superconducting phases, in pressure-temperature electronic phase diagrams. Metaphorically speaking, the superconductivity is in bloom in the garden with the competition among various ground states. Particularly, the superconductivity which competes with charge order is the first example in transition metal oxides. It is accompanied by the dimensional crossover and the enhancement of charge fluctuation. In hollandite vanadium oxide, the metal-insulator transition was found. It is accompanied by the charge order and the formation of spin singlet V^4+-V^4+ pairs inherent in vanadium oxides. Furthermore, a very unique metal-insulator transition remaining ferromagnetic in the insulator phase was discovered in hollandite chromium oxide.
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