2013 Fiscal Year Final Research Report
Investigation of anomalous ground state originating from multipole degrees of freedom in rare earth compounds with cage structure
| Project/Area Number |
24740239
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Tokyo Metropolitan University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2012-04-01 – 2014-03-31
|
| Keywords | 重い電子系 / カゴ状化合物 / 多極子自由度 / 価数自由度 |
|---|
| Research Abstract |
RTr2Al20(R = Pr and Sm) attract much attention since these compounds show various interesting strongly correlated electronic behaviors originating from nonmagnetic and multipole degrees of freedom. In order to investigate the origin, we performed various measurements such as specific heat, valence state, transport and so on.
From these measurements, we revealed that the uncommon heavy fermion state attributed to nonmagnetic quadrupolar interaction is possibly realized in Pr compounds and these compounds may be located near quantum critical point of quadrupolar interaction. For Sm compounds, the field-insensitive behaviors of phase transition and heavy fermion state in the ordered state are typical feature for all of SmTr2Al20 series and the charge fluctuation and the magnetic octupole degrees of freedom may play important roles in the formation of unconventional field-insensitive states.
|
