2011 Fiscal Year Final Research Report
Theory of quantum spin ice, Kondo effect, and anomalous Hall effect in pyrochlore magnets
| Project/Area Number |
21740275
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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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 Institute of Physical and Chemical Research |
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Principal Investigator |
ONODA Shigeki 独立行政法人理化学研究所, 古崎物性理論研究室, 専任研究員 (70455335)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 強相関系 / 磁性 / スピン液体 / スピンアイス / 異常ホール効果 / トポロジー |
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| Research Abstract |
In order to understand the origin of spin ice correlations and quantum fluctuations of Pr magnetic moments in magnetic pyrochlore oxides Pr_2(Ir, Sn)_2O_7, the superexchange interaction between Pr moments has been derived microscopically. Then, I have shown that this theoretical model can host a state characterized by a quantum melting of spin ice and have explained the anomalous Hall conductivity in the chiral spin liquid phase. Generalizing this theoretical framework, neutron-scattering experiments on Pr & _2Sn_2O_7 and Yb & _2Ti_2O_7 have been explained successfully.
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