| Project/Area Number |
22244041
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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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 東京大学, 物性研究所, 教授 (20127054)
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| Co-Investigator(Renkei-kenkyūsha) |
UEDA Hiroaki 京都大学, 理学研究科, 准教授 (10373276)
ISOBE Masahiko 東京大学, 物性研究所, 技術専門職員 (70396919)
YAMAUCHI Toru 東京大学, 物性研究所, 技術専門職員 (10422445)
SHIN Shigi 東京大学, 物性研究所, 教授 (00162785)
FUJIWARA Naoki 京都大学, 人間環境学研究科, 准教授 (60272530)
OHTA Yukinori 千葉大学, 理学研究科, 教授 (70168954)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥45,110,000 (Direct Cost: ¥34,700,000、Indirect Cost: ¥10,410,000)
Fiscal Year 2012: ¥12,870,000 (Direct Cost: ¥9,900,000、Indirect Cost: ¥2,970,000)
Fiscal Year 2011: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2010: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
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| Keywords | 強相関電子系 / 物性実験 / クロム酸化物 / 電磁気物性 / 金属絶縁体転移 / ホランダイト酸化物 / クロムホランダイト / 構造相転移 / 層状ペロフスカイト物質 / マンガンホランダイト / パイエルス転移 / 金属強磁性 |
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| Research Abstract |
Detailed structure analysis by synchrotron x-ray diffraction experiments and the electronic structure calculations demonstrate that the novel ferromagnetic metal-insulator transition in K2Cr8O16 is caused by a Peierls instability in the quasi-one-dimensional column structure made of four coupled Cr-O chains running in the c direction, leading to the formation of tetramers of Cr ions below the transition temperature. This provides a rare example of the Peierls transition of fully spin-polarized electron systems.
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