URu2Si2中力矩振荡、弹性常数反常和场致力矩的隐阶对称性特征
Signatures of hidden order symmetry in torque oscillations, elastic constant anomalies and field induced moments in URu2Si2
摘要：
我们讨论了Okazaki等人[1]最近在旋转磁场中的扭矩实验中可能得出的关于URu 2Si 2中隐藏序（HO）对称性的结论。它们对由HO引起的磁化率的变化非常敏感。我们发现，所观察到的双重角力矩振荡的证据，隐藏的顺序退化E型（YZ，ZX）对称性，实现两个组件。对于一维非平凡表示，如四极B1（x^2-y^2）和B2（xy）型HO或十六极A2（xy（x^2-y^2））型HO，振荡具有错误的特征或不存在。因此，它们可能被排除作为隐藏顺序的候选者。我们还预测了潜在的E型序参量的基础上可能的场致布拉格峰的场角变化，并讨论了预期的弹性常数异常。
英文摘要：
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.
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