2015 Fiscal Year Final Research Report
Study on the ordering states of highly correlated electron systems by ultrasonic measurements in pulsed magnetic field
| Project/Area Number |
25400350
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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 | Iwate University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 超音波測定 / 強相関伝導系 / パルス磁場 / ウラン化合物 / 低温 |
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| Outline of Final Research Achievements |
We have investigated exotic ordering of URu2Si2 and URhGe by ultrasonic measurements in pulsed magnetic field. We focus our attention on the aspect of quantum criticality appearing in magnetic field. URu2Si2 shows very similar behavior of structural quantum criticality in CE=(C11-C12)/2, which was found in iron-based superconductor. Similar structural quantum criticality was also found in URhGe. However, Jahn-Teller energy EJT of Uranium compounds is order of 1 K, while that of the iron-based superconductor is about 50K. This suggests strongly a magnetic origin of quantum critical point in URu2Si2. In addition to CE, URu2Si2 shows remarkable elastic softening in C66 in high magnetic fields, which suggests different type of orthorhombic distortion below the hidden order temperature THO, and participation of Eu symmetry among various proposed candidates. Such behavior would be a common feature near quantum critical point in strongly correlated electron systems.
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| Free Research Field |
物性物理学
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