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Anomalous Magnetic Transition in UNiSn

In concurrence with an antiferromagnetic transition at T N ≃43 K, UNiSn undergoes a semiconductor-to-metal phase transition. The powder X-ray diffraction reveals that the complex transition is accompanied also by a structural transition from a cubic to tetragonal symmetry. The temperature dependence of lattice parameters and that of Mossbauer spectra suggest that the transition is of first order and is a cooperative phenomenon of the structural and magnetic instabilities. However, an elastic modulus behaves as if the transition were of second order. This puzzle is solved by a scenario based on the crystalline-electric-field for 5 f 2 configuration in U 4+ with the ground state of a non-magnetic doublet Γ 3 in the cubic phase.