Control of spin/orbital degrees of freedom and study of critical behavior in 1-dimensional triangle lattice system
| 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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Report
(4 results)
Research Products
(46 results)
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[Journal Article] Strongly three-dimensional electronic structure and Fermi surfaces of SrFe2(As0.65P0.35)2: Comparison with BaFe2(As1-xPx)22014
Author(s)
H. Suzuki, T. Kobayashi, S. Miyasaka, T. Yoshida, K. Okazaki, L. C. C. Ambolode II, S. Ideta, M. Yi, M. Hashimoto, D. H. Lu, Z. –X. Shen, K. Ono, H. Kumigashira, S. Tajima, A. Fujimori
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Journal Title
Physical Review B
Volume: 89
DOI
Related Report
Peer Reviewed
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[Journal Article] Ce electronic states in Nd0.45-xCexSr0.55MnO3 probed by x-ray absorption spectroscopy and photoemission2013
Author(s)
T. Shirai, S. Imada, A. Higashiya, A. Sekiyama, S. Suga, T. Muro, Y. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, S. Miyasaka and Y. Tokura
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Journal Title
Journal of Physics : Condensed Matter
Volume: 25
DOI
Related Report
Peer Reviewed
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[Journal Article] Soft- and Hard-X-ray Photoemission Spectroscopy of La2-2xSr1+2xMn2O72012
Author(s)
H. Fujiwara, A. Sekiyama, H. Sugiyama, G. Funabashi, T. Muro, A. Higashiya, M. Yabashi, K. Tamasaku, T. Ishikawa, S. Miyasaka, H. Nakamura, T. Kimura, Y. Tokura and S. Suga
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Journal Title
J. Phys. Soc. Jpn. Suppl
Volume: 81
DOI
Related Report
Peer Reviewed
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[Presentation] Effect of R ion size variance on spin and orbital order in RVO3 (R=rare earth and Y)2012
Author(s)
S. Miyasaka R. Fukuta, K. Hemmi, N. Sasaki, S. Tajima, D. Kawana, K. Ikeuchi, Y. Yamasaki, A. Nakao, H. Nakao, R. Kumai, Y. Murakami, K. Iwasa
Organizer
The 19th ICM-SCES
Place of Presentation
Busan, Korean
Related Report
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