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

Arthur P. Ramirez; Ekkes Bruck; Jennifer Trinh; Piers Coleman; Premala Chandra; Rebecca Flint; Theo Siegrist

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Thermodynamic Measurement of Angular Anisotropy at the Hidden Order Transition of URu₂Si₂

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arxiv 1608.07009 v1 pith:6OXHHL4X submitted 2016-08-25 cond-mat.str-el

Thermodynamic Measurement of Angular Anisotropy at the Hidden Order Transition of URu₂Si₂

Jennifer Trinh , Ekkes Bruck , Theo Siegrist , Rebecca Flint , Premala Chandra , Piers Coleman , Arthur P. Ramirez This is my paper

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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 fluctuations and low temperature quasiparticles is well established. We present detailed measurements of the angular anisotropy of the nonlinear magnetization that reveal a $\cos^4 \theta$ 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.

Thermodynamic Measurement of Angular Anisotropy at the Hidden Order Transition of URu₂Si₂

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