Trinh Jennifer, Brück Ekkes, Siegrist Theo, Flint Rebecca, Chandra Premala, Coleman Piers, Ramirez Arthur P
Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA.
Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, TU Delft Mekelweg, 15, 2629 JB Delft, Netherlands.
Phys Rev Lett. 2016 Oct 7;117(15):157201. doi: 10.1103/PhysRevLett.117.157201. Epub 2016 Oct 5.
The heavy fermion compound URu_{2}Si_{2} continues to attract great interest due to the unidentified hidden order it develops below 17.5 K. The unique Ising character of the spin fluctuations and low-temperature quasiparticles is well established. We present detailed measurements of the angular anisotropy of the nonlinear magnetization that reveal a cos^{4}θ Ising anisotropy both at and above the ordering transition. With Landau theory, we show this implies a strongly Ising character of the itinerant hidden order parameter.
重费米子化合物URu₂Si₂因其在17.5K以下出现的未确定的隐藏序而持续吸引着极大的关注。自旋涨落和低温准粒子的独特伊辛特性已得到充分证实。我们给出了非线性磁化强度角向各向异性的详细测量结果，这些结果揭示了在有序转变温度及以上均存在cos⁴θ伊辛各向异性。利用朗道理论，我们表明这意味着巡游隐藏序参量具有很强的伊辛特性。
