| Project/Area Number |
24540373
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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 | Osaka University |
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Principal Investigator |
MIYASAKA Shigeki 大阪大学, 理学(系)研究科(研究院), 准教授 (70345106)
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| Co-Investigator(Renkei-kenkyūsha) |
TAJIMA Setsuko 大阪大学, 大学院理学研究科, 教授 (70188241)
MURAKAMI Youichi 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (60190899)
KUMAI Reiji 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (00356924)
NAKAO Hironori 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 准教授 (70321536)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 軌道秩序 / スピンフラストレーション / 金属-絶縁体転移 / 量子臨界点 / Cr置換効果 / 量子臨界相 |
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| Outline of Final Research Achievements |
Critical behaviors of spin/orbital order have been investigated in geometrically frustrated system CaV2O4. CaV2O4 is a Mott insulator, and undergoes orbital order transition around 110 K with decreasing temperature. As a result, spin frustration is suppressed, and CaV2O4 shows antiferromagnetic long-range order below 50 K. The substitution of Cr with 3d3 electronic configuration for V with 3d2 causes the electron doping in this system. The Cr doping induces the disappearance of orbital order, resultantly recovers the spin frustration, and suppresses the long-range magnetic order. In the Cr-doped CaV2O4, we have succeeded in the control of orbital order and spin frustration, which are competing. In addition, the Cr doping induces the metal-insulator transition (Mott transition) as well as spin/orbital order-disorder. At the critical point of spin/orbital order near Mott transition, the non-Fermi liquid behavior by strong spin/orbital fluctuation has been observed.
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