Abstract
UNiSn transforms from a paramagnetic semiconductor to an antiferromagnetic metal at T N=43 K. We have made a detailed neutron scattering study of UNiSn and find well-defined magnetic excitations in the metallic phase, at 10 and 35 meV, with no evidence of excitations at higher energies. The excitations persist in the semiconducting phase, but their lifetime changes rapidly above T N. High-resolution studies reveal a temperature-dependent splitting of the 10 meV peak, consistent with a tetragonal strain induced by quadrupolar ordering.
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