Basal-Plane Nonlinear Susceptibility: A Direct Probe of the Single-Ion Physics in URu2Si2

Abstract

The microscopic nature of the hidden order state in URu2Si2 is dependent on the low-energy configurations of the uranium ions, and there is currently no consensus on whether it is predominantly 5f^2 or 5f^3. Here we show that measurement of the basal-plane nonlinear susceptibility can resolve this issue; its sign at low-temperatures is a distinguishing factor. We calculate the linear and nonlinear susceptibilities for specific 5f^2 and 5f^3 crystal-field schemes that are consistent with current experiment. Because of its dual magnetic and orbital character, a Γ_5 magnetic non-Kramers doublet ground-state of the U ion can be identified by ${\chi }_1^c(T)\propto {\chi }_3^{\perp }(T)$ where we have determined the constant of proportionality for URu2Si2.

7 pages, 4 figures

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Cited by in corpus (6)

• Hastatic Order in URu2Si2
• Hastatic Order in URu2Si2 : Hybridization with a Twist
• Strict limit on in-plane ordered magnetic dipole moment in URu2Si2
• Universality in the Magnetic Response of Metamagnetic Metals
• Hidden and Hastatic Orders in URu2Si2
• Spins, electrons and broken symmetries: realizations of two channel Kondo physics