2017 Fiscal Year Final Research Report
Novel superconductivity and thermoelectric properties of polar metals associated with structural instability
| Project/Area Number |
16K17736
|
|---|
| 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 |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2016-04-01 – 2018-03-31
|
| Keywords | 強相関電子 / 熱電材料 / 超伝導 / 圧力効果 |
|---|
| Outline of Final Research Achievements |
We have succeeded in controlling a structural transition temperature by physical and chemical pressure in a layered transition metal dichalcogenide MoTe2 showing a polar to nonpolar structural transition. The physical pressure as well as the chemical pressure enhances the superconducting transition temperature at around the critical pressure where the polar structural transition disappears. In addition, we have measured the thermoelectric properties under the physical pressure, and found that the low-temperature thermopower is anomalously enhanced at the critical pressure. This enhanced thermopower results in a gigantic thermoelectric power factor of 300 uWK-2cm-1 As the origin of this unusual thermoelectric properties, we propose an inelastic electron-phonon scattering model.
|
| Free Research Field |
物性物理学
|
