Project/Area Number |
24740243
|
Research Category |
Grant-in-Aid for Young Scientists (B)
|
Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics II
|
Research Institution | The University of Tokyo (2013) Nihon University (2012) |
Principal Investigator |
|
Project Period (FY) |
2012-04-01 – 2014-03-31
|
Project Status |
Completed (Fiscal Year 2013)
|
Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
|
Keywords | 量子臨界現象 / イットリウム化合物 / 非フェルミ液体 / 重い電子系 / X線回折 / X線回折 |
Research Abstract |
We study the Yb based heavy fermion compounds, YbAlB4, which is example of quantum criticality in a mixed-valence system at ambient pressure and superconducting transition at 80mK. Our investigation for the pressure vs temperature phase diagram for the superconducting state near quantum critical point (QCP), a pressure-induced magnetic order, and crystal structure under pressure lead to an important result for the Yb based heavy fermion superconducting system near QCP. Specially, the superconducting state is isolated and exists without connecting magnetic order where Normally, quantum criticality of an Yb-based heavy fermion system is found next to a magnetic order stabilized by application of pressure.Moreover, this non-Fermi liquid hidden by the superconducting state is robust against the pressure. which is ever known at all. But, it is thought that this Yb material exhibits a new type superconductivity and a unconventional quantum criticality.
|