High-energy magnetic excitations of URu2Si2 -: art. no. 094502

We have investigated the magnetic excitations of URu2Si2 up to 800 meV using high energy inelastic neutron scattering. There is clear evidence of magnetic scattering in the energy range up to 200 meV. This scattering can be fitted to four broad peaks which we attribute to heavily damped crystal field excitations. We also observed the U4+ H-3(4)-->F-3(2) intermultiplet transition at 363 meV, which is a clear evidence of U4+ of URu2Si2. We discuss our results with special attention to theoretical models proposed to explain the single ion physics of URu2Si2, in particular the antiferromagnetic transition.