Investigation of anomalous ground state on geometrically frustrated magnet

几何受挫磁体异常基态研究

• 批准号: 21740261
• 负责人: HIGASHINAKA Ryuji
• 金额: $ 2.91万
• 依托单位: Tokyo Metropolitan University
• 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 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740261/
• 关键词: 幾何学的フラストレーション; パイロクロア酸化物; スピンアイス; カゴ状構造; 重い電子状態; 四極子近藤効果

Pyrochlore oxide Tb_2Ti_2O_7 dose not show any long range ordering down to 20mK and the true ground state had not established yet. Recently, theorists proposed that in the ground state of this material the "quantum spin ice" state is realized. This state consists of the superposition of six classical spin ice states by the hybridization of first excited doublet. From the DC magnetization and specific heat measurements down to 100 mK in the magnetic field along [100], [110], [111] directions, we clarified the Ising-like magnetic anisotropy and the plateau-like feature is observed below 0.5K similar to the Kagome-plateau of spin ice compounds. In addition, we observed the anomaly in specific heat indicating the phase transition to quantum spin ice state.

烧绿石氧化物Tb_2Ti_2O_7在20mK以下没有表现出长程有序，真正的基态尚未建立。最近，理论家提出，在这种材料的基态中，“量子自旋冰”状态是实现的。该态是由六个经典自旋冰态通过第一激发二重态的杂化叠加而成。在磁场沿着[100]，[110]，[111]方向的直流磁化强度和比热测量结果表明，该化合物具有Ising型磁各向异性，并在0.5K以下观察到类似于自旋冰化合物的Kagome平台的平台特征。此外，我们还观察到了比热的异常，这表明相变到了量子自旋冰态。

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