Study of low-energy magnetic excitations in single-crystalline CeIn3 by inelastic neutron scattering

Inelastic neutron scattering experiments were performed on single crystals of the heavy-fermion compound CeIn3 for temperatures below and above the Neel temperature, T-N. In the antiferromagnetically ordered phase, well-defined spin-wave excitations with a bandwidth of 2 meV are observed. The spin waves coexist with quasielastic (QE) Kondo-type spin fluctuations and broadened crystal-field (CF) excitations below T-N. Above T-N, only the QE and CF excitations persist, with a weak temperature dependence.