| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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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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