Signatures of hidden-order symmetry in torque oscillations, elastic constant anomalies, and field-induced moments in URu2Si2
Signatures of hidden-order symmetry in torque oscillations, elastic constant anomalies, and field-induced moments in URu2Si2
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DOI：
10.1103/physrevb.83.165110
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发表时间：
2011-02
影响因子：
3.7
通讯作者：
P. Thalmeier;T. Takimoto
中科院分区：
文献类型：
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作者：
P. Thalmeier;T. Takimoto
我们讨论了 URu2Si2 中隐序 (HO) 对称性的结论，这些结论可能是从 Okazaki 等人最近在旋转磁场中的扭矩实验中得出的。 [1]。它们对 H2O 引起的磁化率变化非常敏感。我们表明，观察到的双重角扭矩振荡证明隐藏顺序具有简并的 E 型 (yz,zx) 对称性，其中两个分量均已实现。对于四极 B1 (x^2-y^2) 和 B2 (xy) 类型 HO 或十六极 A2(xy(x^2-y^2)) 类型 HO 等一维非平凡表示，振荡具有错误的特征或不存在。因此，他们可能被排除在隐藏秩序的候选者之外。我们还根据基础 E 型序参数预测可能的场诱导布拉格峰的场角变化，并讨论预期的弹性常数异常。
We discuss the conclusions on the symmetry of hidden order (HO) in URu2Si2 that may be drawn from recent torque experiments in rotating magnetic field by Okazaki et al. [1]. They are very sensitive to changes in the magnetic susceptibility induced by HO. We show that the observed twofold angular torque oscillations give evidence that hidden order has degenerate E- type (yz,zx) symmetry where both components are realised. The oscillations have the wrong characteristics or are absent for the 1D nontrivial representations like quadrupolar B1 (x^2-y^2) and B2 (xy) type HO or hexadecapolar A2(xy(x^2-y^2)) type HO. Therefore they may be excluded as candidates for hidden order. We also predict the field-angular variation of possible field-induced Bragg peaks based on underlying E-type order parameter and discuss the expected elastic constant anomalies.