| Project/Area Number |
15K05182
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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 | University of Hyogo |
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Principal Investigator |
Kobayashi Hisao 兵庫県立大学, 物質理学研究科, 教授 (40250675)
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| Co-Investigator(Kenkyū-buntansha) |
池田 修悟 兵庫県立大学, 物質理学研究科, 助教 (80414580)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKATSUJI Satoru 東京大学, 物性研究所, 教授 (70362431)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | メスバウー分光 / 価数揺動 / 量子臨界性 / 電荷揺らぎダイナミックス / メスバウアー分光 / 放射光X線 / 量子臨界点 / 多重極限 / X線吸収分光 |
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| Outline of Final Research Achievements |
The synchrotron-radiation based 174Yb Mossbauer spectroscopy is a state-of-the-art technique to investigate the Yb electronic states in materials. We have carried out the first measurement under multi-extreme conditions in the world. The 174Yb ossbauer spectra of b-YbAlB4 observed at lower temperature than 5 K are revealed that the valence fluctuation time is slower than 1 ns. Furthermore, our measurements of 174Yb Mossbauer spectra for b-YbAlB4 under high-pressure at 2K indicate that this slower valence fluctuation in b-YbAlB4 is suppressed at about 2 GPa by external pressure. These results make it clear that the slower valence fluctuation in b-YbAlB4 at a lower temperature and ambient pressure corresponds to the anomalous quantum criticalities. This is a first clear experimental evidence of the relation between quantum criticalities and valence fluctuations.
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