Connection between -electron correlations and magnetic excitations in UTe.

The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetry and points and disperse along the crystallographic -axis. In applied magnetic fields to at least = 11 T along the , the magnetism is found to be field-independent in the ( 0) plane. The scattering intensity is consistent with that expected from U/U -electron spins with preferential orientation along the crystallographic -axis, and a fluctuating magnetic moment of =1.7(5) . We propose interband spin excitons arising from -electron hybridization as a possible origin of the magnetic excitations in UTe.