Thermodynamic Measurement of Angular Anisotropy at the Hidden Order Transition of URu${}_2$Si${}_2$

Jennifer Trinh, Ekkes Bruck, Theo Siegrist +4

The heavy fermion compound URu${}_2$Si${}_2$ continues to attract great interest due to the unidentified hidden order it develops below 17.5K. The unique Ising character of the spin fl…