2017 Fiscal Year Final Research Report
High-pressure study of quantum phase transition and exotic superconductivity associated with orbital degrees of freedom
| Project/Area Number |
15K05161
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 高圧力 / 超伝導 / 軌道 / 量子相転移 / 近藤効果 |
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| Outline of Final Research Achievements |
PrT2Al20 (T=Ti,V) with non-magnetic doublet ground state provides the unique opportunity to study the strong hybridization effect between the ground doublet and conduction electrons, which gives rise to the quadrupolar Kondo effect as well as superconductivity. In this study, we have investigated the effect of pressure on PrT2Al20 (T=Ti,V) and constructed the detail phase diagrams to shed light on the interplay between the quadrupole order and superconductivity. In both compounds, applying pressure suppresses the quadrupole order and a dome-like superconducting phase emerges. We also found that the anomalous metallic state emerges in wide pressure and field range, as predicted for the quadrupole Kondo lattice model.
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| Free Research Field |
高圧物性
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