2014 Fiscal Year Final Research Report
clarification of the anomalous metallic state in the yb based heavy fermion compounds under ultimate environment
| Project/Area Number |
25887015
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2013-08-30 – 2015-03-31
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| Keywords | 高磁場 / 圧力 / イッテルビウム / 重い電子 |
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| Outline of Final Research Achievements |
We found a field-tuned quantum criticality based solely on the quadrupolar(orbital) degrees of freedom in PrV2Al20 through the magneto-transport measurements up to 35 T by using the high DC magnetic field facilities at the National High Magnetic Field Laboratory.
Our study on PrV2Al20 reveals the field-induced quadrupolar quantum criticality at the critical field Hc = 11 T applied along the [111] direction. Near Hc required to suppress the quadrupolar state, we found a marked enhancement of the resistivity, concomitant non-Fermi liquid (NFL) behavior in the vicinity of critical field, and a divergent quasiparticle effective mass as a function of the magnetic field toward critical field of 11 T. We also observed the quantum oscillation above Hc, indicating an evidently enhanced effective mass. These reveal the field induced quadrupolar quantum criticality where the competition between the nonmagnetic Kondo effect and the intersite quadrupolar coupling.
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| Free Research Field |
強相関電子物性
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