Theory of quantum spin ice, Kondo effect, and anomalous Hall effect in pyrochlore magnets

烧绿石磁体中的量子自旋冰理论、近藤效应和反常霍尔效应

• 批准号: 21740275
• 负责人: ONODA Shigeki
• 金额: $ 2.83万
• 依托单位: The Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740275/
• 关键词: 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; 強相関電子系; ゲージ理論; ヒッグス転移; ベリー位相; スピンカイラリティー; 近藤効果

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.

为了理解磁性烧绿石氧化物Pr_2(Ir,Sn)_2O_7中自旋冰相关性和Pr磁矩量子涨落的起源，从微观上推导了Pr磁矩之间的超交换相互作用。然后，我证明了该理论模型可以呈现以自旋冰量子熔化为特征的状态，并解释了手性自旋液相中的反常霍尔电导率。推广这一理论框架，成功地解释了 Pr & _2Sn_2O_7 和 Yb & _2Ti_2O_7 的中子散射实验。