Spin and lattice excitations in the heavy-fermion superconductor UNi2Al3

Inelastic neutron scattering measurements have been carried out on the heavy fermion superconductor UNi2Al3. This hexagonal material orders magnetically into an incommensurate structure, characterized by the ordering wave vector Qord=(1/2±τ, 0, 12) with τ∼0.11, below TN=4.6 K and then superconducts below TC=1.2 K. For energies above 2 meV, we observe quasielastic magnetic neutron scattering both near (0, 0, n/2) and in ridges along H of the …