Abstract
We have performed inelastic neutron scattering (INS) experiments onCeRh3B2 at various temperatures to obtain direct information on the crystal electric field(CEF) in this compound, which exhibits some very peculiar magnetic propertiesfor a Ce system: it is ferromagnetic with an unusually high Curie temperature(115 K), which contrasts with a strongly reduced and anisotropic magnetization(0.4 µB/fu withinthe c-plane of the hexagonal structure). Measurements with high incident energies show only one welldefined magnetic excitation around 150 meV, its exact position varying with the temperature.These results, combined with our previous data of magnetization and magnetic form factor,have permitted us to determine the CEF energy level scheme taking into account the twoJ multipletsof the Ce3+ ion. Information on the ground state (quasielastic contribution and ground state moment)has also been obtained by experiments at low incident energies in the paramagneticstate.
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