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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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 高圧力 / 超伝導 / 軌道 / 量子相転移 / 近藤効果 / 圧力誘起相転移 / 軌道秩序 / 量子臨界現象 / 四極子秩序 |
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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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Report
(4 results)
Research Products
(34 results)
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[Journal Article] Dome-Shaped Magnetic Order Competing with High-Temperature Superconductivity at High Pressures in FeSe2016
Author(s)
J. P. Sun, K. Matsuura, G. Z. Ye, Y. Mizukami, M. Shimozawa, K. Matsubayashi, M. Yamashita, T. Watashige, S. Kasahara, Y. Matsuda, J.-Q. Yan, B. C. Sales, Y. Uwatoko, J.-G. Cheng, and T. Shibauch
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Journal Title
Nature Communications
Volume: 7
Pages: 12146-12146
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] 重い電子系化合物Yb(Co1-xIrx)2Zn20の物性2018
Author(s)
瑞慶覧長星, 佐藤信, 高村治希, 小林理気, 阿曽尚文, 植田大地, 池田陽一, 吉田雅洋, 吉澤英樹, 松林和幸, 郷地順, 上床美也
Organizer
日本物理学会 第73回年次大会
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