Magnetic susceptibility and electron spin resonance experiments in the rare earth (R = Nd, Er, and Yb) 5-25% doped cubic intermetallic LuInNi4 enable estimates of the fourth A4 and sixth A6 order crystal-field parameters for this compound. These parameters yield a Γ6 doublet, a Γ7 doublet, and a Γ8 quartet as the ground states for Nd3+, Er3+, and Yb3+, respectively, and an overall crystal-field splitting of 100-300 K. The A4 and A6 parameters are found to have comparable order of magnitude for all the R studied and their values are in agreement with reported values for other cubic systems.

Electron spin resonance (ESR) and magnetic-susceptibility experiments in the rare-earth-doped (R=Nd, Er, and Yb) cubic semiconducting YBiPt allow estimates of the fourth (Formula presented) and sixth (Formula presented) order crystal-field parameters for this compound. It is found that these parameters are of the same order for all the R studied. On the other hand, no crystal-field effects were found for the (Formula presented) doped single-crystal system. Consistent with the small gap semiconducting character of the YBiPt intermetallic compound, a Dysonian ESR line shape with no g shift and Korringa broadening was observed. © 1999 The American Physical Society.

Electron spin resonance (ESR) experiments at 4.15 K of Er3+ in YBiPt show that Er3+ is in a site of cubic local symmetry, with a Γ(3)8 ground state and an overall crystal field splitting of ∼ 85(10) K. We inferred from the spectra the existence of lattice distortions at the rare-earth (RE) site. These results may help in understanding the heavy-fermion system YbBiPt, which has the same structure as YBiPt.