Magnetic susceptibility data suggest that the crystal field splittings of the 4f levels of Ce and Pr impurities are larger in metallic YB6 than in isostructural and semiconducting SrB6, contrary to what might be expected. © 1969.

Some history from a personal viewpoint is given of materials-driven heavy Fermion physics. © 2006 Elsevier B.V. All rights reserved.

The author provides some remarks regarding the current status of experiments in strongly correlated electron systems. By construction, they are biased by the author's perspectives at the time of writing. © Published under licence by IOP Publishing Ltd.

The contribution to the electrical resistivity of NdB6 arising from temperature dependent crystal field level populations is experimentally measured and accounted for by theory. © 1976.

We report on the electrical resistivity and magnetic susceptibility of La or Gd doped R CrSb3 (R=La, Pr, Sm, and Gd). Single crystals were grown by increasing the nominal dopant by 25%. In general, two magnetic ordering transitions are found, Tc1 is attributed to ferromagnetic ordering of the itinerant Cr sublattice, and, at lower temperatures, Tc2 is attributed to ordering of the localized rare-earth sublattice. Alloying on the rare-earth site varies the de Gennes factor, DG= (g-1)2 J (J+1), and d Tc1 d (DG) =-2 K, while d Tc2 d (DG) =5 K. These ordering temperatures are found to converge at GdCrSb3, where a single ferrimagnetic transition is found at Tc2 =86 K due to an antialignment of the itinerant Cr magnetic sublattice and the localized rare-earth magnetic sublattice. Initially, for DG<3.5, the two magnetic sublattices order in a ferromagnetic ground state, and the paramagnetic Weiss temperature decreases at the same rate as Tc1. But for DG>4.5, the rare-earth magnetic sublattice antialigns with respect to the Cr sublattice, and the Weiss temperature decreases five times as fast. In the region between (3.5

From measurements of the electrical resistance of heavy-fermion CeCu6 subjected to hydrostatic pressures, we infer a continuous pressure-induced transition from Kondo-lattice to more strongly mixed-valence behavior. The resistance is found to scale over an appreciable temperature interval with a pressure-dependent characteristic temperature that reflects this transition. Similarities in the resistive behaviors of CeCu6 and CeAl3 are discussed. © 1985 The American Physical Society.