Abstract
We reexamine the octupole order model, for the hidden order (HO) in URu2Si2, based on the Γ1–Γ5 (singlet–doublet) crystalline-electric-field level scheme for 5f2 of U4+ ions. As the predominant octupole moments of Eu symmetry consistent with the characteristics of the HO, not only the type of \((x(y^{2} - z^{2}),y(z^{2} - x^{2}))\) proposed previously but also that of \((x(5x^{2} - 3r^{2}),y(5y^{2} - 3r^{2}))\) should be considered. We discuss that the magnetic moment distribution caused by these octupole orders can be verified experimentally by means of neutron diffraction, X-ray magnetic diffraction, and resonant X-ray scattering.
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