=0ptcontrast to magnetic order formed by electrons’ dipolar moments, ordering phenomena associated with higher-order multipoles (quadrupoles, octupoles, etc.) are more difficult to characterize because of the limited choice of experimental probes that can distinguish different multipolar moments. The heavy-fermion compound and its La-diluted alloys are among the best-studied realizations of the long-range-ordered multipolar phases, often referred to as "hidden order". Previously the hidden order in phase~II was identified as primary antiferroquadrupolar (AFQ) and field-induced octupolar (AFO) order. Here we present a combined experimental and theoretical investigation of collective excitations in the phase~II of . Inelastic neutron scattering (INS) in fields up to $16.5$~T reveals a new high-energy mode above 14~T in addition to the low-energy magnetic excitations. The experimental dependence of their energy on the magnitude and angle of the applied magnetic field is compared to the results of a multipolar interaction model. The magnetic excitation spectrum in rotating field is calculated within a localized approach using the pseudo-spin presentation for the ${\Gamma }_8$ states. We show that the rotating-field technique at fixed momentum can complement conventional INS measurements of the dispersion at constant field and holds great promise for identifying the symmetry of multipolar order parameters and the details of inter-multipolar interactions that stabilize hidden-order phases.

中文翻译：

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场角分辨磁激励作为CeB6中隐伏对称的探针

= 0 pt与电子偶极矩形成的磁阶相反，与高阶多极子（四极子，八极子等）相关的有序现象由于难以区分不同的多极矩的实验探针的选择而更加难以表征。重金属离子化合物及其La稀释的合金是对长程有序多极相（通常称为“隐藏有序”）的最佳研究方法。以前，II期的隐性阶被确定为原反铁四极（AFQ）和场致八极（AFO）阶。在这里，我们提出了实验的结合实验和理论研究的集体相中的激发。非弹性中子散射（INS）$16.5$〜T揭示了在14〜T以上的新高能模式，以及低能磁激发。将其能量对所施加磁场的大小和角度的实验依赖性与多极相互作用模型的结果进行了比较。旋转场中的磁激发光谱是在局部方法中使用伪自旋表示来计算的。${\Gamma }_8$状态。我们表明，在固定动量下的旋转场技术可以补充常规INS测量在恒定场上的色散，并且对于识别多极阶参数的对称性和稳定隐伏阶相的多极间相互作用的细节具有广阔的前景。