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Magnetic interactions and crystal field in RMg3 compounds (R = Ce,Pr, Nd)
Authors:R.M. Galera  A.P. Murani  J. Pierre
Affiliation:2. Institut Laue-Langevin, 156X, 38042 Grenoble-cédex, France
Abstract:We have carried out a study of magnetic properties, electrical resistivity and of crystal field excitations using inelastic neutron scattering, in cubic RMg3 compounds with light rare earths R = Ce, Pr and Nd. The ground states are the Γ7 and Γ6 doublets for CeMg3 and NdMg3, which order at 3.5 and 6.5 K, respectively. PrMg3 has the non-magnetic Γ3 ground state and remains a Van Vleck paramagnet. The magnetic contribution to the resistivity has been separated. It allows us to evaluate the couplings between the 4f shell and the conduction band which is much larger for CeMg3 than for the other compounds. The coupling constant Γ is negative in this case, as shown by an incipient Kondo effect in this compound.
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