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Neutron-scattering measurements of long-range antiferromagnetic order in URu2Si2.

Neutron scattering from a high-quality single crystal of the heavy-fermion superconductor URu{sub 2}Si{sub 2} has shown the onset of the small, antiferromagnetic ordered moment (0.037{mu}{sub {ital B}}) occurs abruptly at {ital T}{sub {ital N}}, unlike the gradual onset in previously studied samples. The results are in good agreement with x-ray-resonance magnetic scattering. The magnitude of the moment and the magnetic excitation spectrum are the same as previously observed, including the anomalous damping of excitations with a component of momentum transfer along the {ital c}{sup *} axis. This shows that these are intrinsic properties of URu{sub 2}Si{sub 2} and confirms the microscopic coexistence of antiferromagnetism and superconductivity.