Abstract
Neutron scattering experiments on UPt 3 and U 1− x Th x Pt 3 are reviewed. At relatively high energies (≈ 5 meV), the magnetic fluctuation spectrum is modulated by the structure factor derived from short-range antiferromagnetic correlations where the two U ions in each unit cell are oppositely polarized. In contrast, at low energies (≤ 1 meV), the diffuse inelastic scattering is associated with antiferromagnetic correlations where the unit cell is doubled. Nominally pure UPt 3 exhibits magnetic order with the wavevector corresponding to this doubling and a static moment of (0.02±0.01)μ B. (U 1− x Th x )Pt 3 with x ≈ 0.05 exhibits ordering of the same type, but with a much larger static moment, (0.65±0.1)μ B. Neutron scattering measurements on UPt 3 with implications for superconductivity are surveyed.
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