Quantum critical behaviors induced by a magnetic frustration in 4f hole systems under pressures
| Project/Area Number |
25400375
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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 | Hiroshima University |
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Principal Investigator |
Umeo Kazunori 広島大学, 自然科学研究支援開発センター, 准教授 (10223596)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKABATAKE Toshiro 広島大学, 大学院先端物質科学研究科, 教授 (40171540)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 高圧力 / 量子臨界現象 / ４fホール系 / フラストレーション / 磁気フラストレーション / 4fホール系 / 非フェルミ液体的挙動 / 比熱 / 磁化 |
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| Outline of Final Research Achievements |
We developed a low-temperature AC calorimeter for measuring the absolute value of specific heat under pressures up to 10 GPa.
In YbAgGe, Yb atoms form a quasi-kagome lattice in the hexagonal c-plane. With increasing x of YbAg1-xAuxGe, We found that the magnetic ordering temperature at 0.8 K increases up to 1.3 K for x = 0.11, while the Kondo temperature rises. These observations suggest that the magnetic frustration in the Yb sublattice is released by the atomic disorder in the nonmagnetic Ag-Ge sublattice. We have investigated the uniaxial and hydrostatic pressure effects on the antiferromagnetic order at TN=4.2 K of YbCuGe with a triangular lattice of Yb ions. For P//a up to 0.17 GPa, where the Yb triangular lattice is distorted, the TN increases up to 4.5 K. These contrasting responses indicate that the distortion under P//a releases the magnetic frustration and stabilizes the antiferromagnetic order in YbCuGe.
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Report
(4 results)
Research Products
(21 results)
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[Journal Article] Electronic structure of YbNiX3 (X=Si,Ge) studied by hard x-ray photoemission spectroscopy2015
Author(s)
H. Sato, Y. Utsumi, J. Kodama, H. Nagata, M. A. Avila, R. A. Ribeiro, K. Umeo, T. Takabatake, K. Mimura, S. Motonami, H. Anzai, S. Ueda, K. Shimada, H. Namatame, M. Taniguchi
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Journal Title
Physica Status Solidi C
Volume: 12
Issue: 6
Pages: 620-623
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Pressure-induced valence change of YbNiGe3 investigated by resonant x-ray emission spectroscopy at the Yb L-3 edge2014
Author(s)
Sato, H, Yamaoka, H, Utsumi, Y, Nagata, H, Avila, MA, Ribeiro, RA, Umeo, K, Takabatake, T, Zekko, Y, Mizuki, J, Lin, JF, Hiraoka, N, Ishii, H, Tsuei, KD, Namatame, H, Taniguchi, M
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Journal Title
PHYSICAL REVIEW B
Volume: 89
Issue: 4
Pages: 45112-45112
DOI
Related Report
Peer Reviewed
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