Research of quantum phase transitions under high magnetic field using synchrotron x-rays
| Project/Area Number |
22244047
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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 | Japan Atomic Energy Agency |
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Principal Investigator |
INAMI Toshiya 独立行政法人日本原子力研究開発機構, 原子力科学研究部門量子ビーム応用研究センター, 研究主幹 (30354989)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUDA Yasuhiro 東京大学, 物性研究所, 准教授 (10292757)
OKAMOTO Jun 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, 特任助教 (50555258)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥42,250,000 (Direct Cost: ¥32,500,000、Indirect Cost: ¥9,750,000)
Fiscal Year 2013: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2011: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2010: ¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
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| Keywords | パルス磁場 / X線吸収分光 / 価数転移 / メタ磁性転移 / cf混成 / 価数揺動 / スピン状態転移 / Ｘ線吸収分光 |
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| Research Abstract |
In this research project, we applied microscopic techniques that utilize synchrotron x-rays, such as x-ray absorption spectroscopy, to quantum phase transitions that occur at low temperatures and in high magnetic fields in order to reveal the order parameters and the electronic states in the quantum critical regime. In Ce-based heavy Fermion compounds, we measured the Ce valence as a function of magnetic field in detail and revealed how itinerancy of the 4f electrons is suppressed by magnetic field. In Yb-based heavy Fermion compounds, it was found that a valence transition gives rise to the metamagnetic transition in YbAgCu4 and that the electronic anomalies reported so far in YbRh2Si2 are not accompanied by a large change in electronic structure, such as Fermi surface reconstruction.
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Report
(5 results)
Research Products
(30 results)
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[Journal Article] Temperature and Magnetic Field Dependent Yb Valence in YbRh_2Si_2 Observed by X-ray Absorption Spectroscopy2013
Author(s)
Hirohito NAKAI, Takao EBIHARA, Satoshi TSUTSUI, Masaichiro MIZUMAKI, Naomi KAWAMURA, Shinji MICHIMURA, Toshiya INAMI, Toshiyuki NAKAMURA, Akihiro KONDO, Koichi KINDO, and Yasuhiro H. MATSUDA
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Journal Title
Journal of the Physical Society of Japan
Volume: Vol. 82
Issue: 12
Pages: 124712-124712
DOI
Related Report
Peer Reviewed
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[Journal Article] High Magnetic Field X-ray Absorption and Magnetic Circular Dichroism Spectroscopy in the Mixed-Valent Compound YbAgCu_42012
Author(s)
Toshiyuki Nakamura, Yasuhiro H. Matsuda, Jim-Long Her, Koichi Kindo, Shinji Michimura, Toshiya Inami, Masaichiro Mizumaki, Naomi Kawamura, Motohiro Suzuki, Bin Chen, Hiroto Ohta, Kazuyoshi Yoshimura, Akio Kotani
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Journal Title
J. Phys. Soc. Jpn
Volume: Vol. 81
Issue: 11
Pages: 114702-114702
DOI
Related Report
Peer Reviewed
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