2020 Fiscal Year Annual Research Report
Experimental Study of Novel Quantum Phases and Criticality in Multipolar Kondo Materials
| Project/Area Number |
20F20028
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| Research Institution | The University of Tokyo |
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Principal Investigator |
中辻 知 東京大学, 大学院理学系研究科(理学部), 教授 (70362431)
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| Co-Investigator(Kenkyū-buntansha) |
FU MINGXUAN 東京大学, 理学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2020-04-24 – 2022-03-31
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| Keywords | Multipolar Kondo effect / Non-Fermi-liquids / Quantum criticality / Strongly correlated / electrons |
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| Outline of Annual Research Achievements |
Over the past academic year, we aim to comprehensively characterize the field-induced multipolar Kondo system PrV2Al20, focusing on understanding its non-Fermi-liquid behavior and Fermi surface evolution near the multipolar quantum critical point. We conducted electrical transport measurements down to millikelvin temperatures and in magnetic fields up to 40T.
We successfully detected universal scaling in magnetoresistance, Shubnikov-de Haas (SdH) oscillations, and dramatic changes in the Hall coefficient on approaching the quantum critical regime; these findings provide essential information on the critical behavior and Fermi surface topology. Moreover, we obtained high-precision thermodynamic information on the non-Fermi liquid phase intrinsic to the multipolar Kondo effect.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We have incorporated high-field and low-temperature thermodynamic measurements with the transport study in collaboration with colleagues at the International MegaGauss Science Laboratory, ISSP. These measurements offer critical insights into the strange behavior, enabling us to explore the temperature-field phase diagram in great depth. The results we obtained so far may provide essential new perspectives on orbital-induced quantum phenomena in strongly correlated electron systems and thus may lead to a high-impact publication.
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| Strategy for Future Research Activity |
We will continue our transport measurements under extreme conditions, particularly extending to lower temperatures. Such experiments will allow us to explore further the fate of the Kondo entanglement near the multipolar quantum critical point. We will also continue to collaborate closely with Dr. Hicks group at Max Planck institute on setting the uniaxial strain measurements in the coming year.
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