Theoretical research on novel quantum states and phenomena induced by magnetic monopoles in pyrochlore materials
Project/Area Number |
24740253
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics II
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Research Institution | Institute of Physical and Chemical Research |
Principal Investigator |
Onoda Shigeki 国立研究開発法人理化学研究所, 古崎物性理論研究室, 専任研究員 (70455335)
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Project Period (FY) |
2012-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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Keywords | 磁性 / 物性理論 / スピン液体 / スピンアイス / トポロジカル絶縁体 / 量子スピンアイス / 量子スピン液体 / ゲージ場 / イリジウム酸化物 |
Outline of Final Research Achievements |
Novel phases and phenomena induced by emergent fictitious monopoles in pyrochlore oxides have been revealed. For quantum spin ice systems where the quantum magentism originates from rare-earth magnetic moments, we have provided theoretical evidence of a continuous crossover from a classical spin ice characterized by localized monopoles to a quantum spin liquid showing quantum dynamics of monopoles. Through analyses of extensive experimental results on a basis of a quantum spin ice model, we have uncovered that Yb2Ti2O7 and Tb2Ti2O7 are located in Higgs-confining ordered phases with Bose-condensed monopoles. Our first-principles calculations have clarified the electronic structures of the paramagnetic semimetal Pr2Ir2O7 and the antiferromagnetic insulator Y2Ir2O7, and shown the conditions of the emergence of Weyl points acting as monopoles in the reciprocal lattice space.
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Report
(5 results)
Research Products
(51 results)
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[Journal Article] Quadrupole Order in the Frustrated Pyrochlore Tb2+xTi2-xO7+y2016
Author(s)
H. Takatsu, S. Onoda, H. Takatsu, S. Kittaka, A. Kasahara, Y. Kono, T. Sakakibara, Y. Kato, B. Fak, J. Ollivier, J. W. Lynn, T. Taniguchi, M. Wakita, H. Kadowaki
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Journal Title
Physical Review Letters
Volume: 未定
NAID
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Quantum spin ice2014
Author(s)
Shigeki Onoda
Organizer
Nordita programme: "Novel Directions in Frustrated and Critical Magnetism"
Place of Presentation
Nordita, Nordic Institute of Theoretical Physics, KTH Royal Institute of Technology, Stockholm, Sweden
Year and Date
2014-07-14 – 2014-08-08
Related Report
Invited
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[Presentation] Quantum spin ice2012
Author(s)
Shigeki Onoda
Organizer
KITP Program: "Frustrated Magnetism and Quantum Spin Liquids: From Theory and Models to Experiments
Place of Presentation
Kavli Institute of Theoretical Physics, Santa Barbara, USA
Related Report
Invited
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