We propose a model based on quadrupolar ordering of localized f electrons to explain the 17.5 K phase transition of URu2Si2. The tiny staggered magnetic moment observed by neutron scattering is interpreted as a weak secondary effect associated to the symmetry-breaking perturbation. The model is able to account for the observed behavior of the linear and nonlinear susceptibilities throughout the transition. A connection with the quadrupolar Kondo theory is proposed.
CRYSTAL-FIELD MODEL OF THE MAGNETIC-PROPERTIES OF URU2SI2 / P. Santini; G. Amoretti. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 73(1994), pp. 1027-1030. [10.1103/PhysRevLett.73.1027]
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