| Project/Area Number |
23840039
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
OKAWA Mario 東京理科大学, 理学部, 助教 (50609302)
|
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| Project Period (FY) |
2011 – 2012
|
| Project Status |
Completed (Fiscal Year 2012)
|
| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 強相関電子系 / 重い電子系 / 価数揺動 / 量子臨界点 / 光電子分光 / 価数謡動 |
|---|
| Research Abstract |
In a heavy fermion α-YbAlB4, unconventional quantum criticality and antiferromagnetic order can be induced by a few % Al-Fe substitution. To clarify the nature of this quantum criticality in the α-Yb(Al,Fe)B4system, we investigate temperature- and Fe-doping-dependence of the Yb valence, which reflects heavy-electron and magnetic states, in detail using hard x-ray photoemission spectroscopy. As a result, we found the sharp crossover at the quantum critical region in the Fe-doping dependence of the Yb valence and its characteristic temperature of ～100 K.
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