The magnetic properties of the RRh4B4 (R represents rare-earth metal) compounds are discussed in terms of a combined crystalline-electric-field and molecular-field approach. Magnetization data taken on single-crystal ErRh4B4 in five orientations are used to obtain the crystal-field and molecular-field coefficients, resulting in a complete analysis for the paramagnetic properties of this compound. The crystal-field parameters are additionally used to discuss all previously published magnetic data for polycrystalhne RRh4B4 compounds. For these highly anisotropic materials, the effect of preferential crystallite orientation on the observed data is pointed out. Consideration of the variation of the magnetic transition temperature T between different constituent rare earths has verified a previous conclusion that the crystal field has a pronounced effect on T, but this alone does not fully explain the observations.
The magnetic and superconducting properties of the Heusler alloy Pd2YbSn have been investigated with heat-capacity, resistivity, and magnetic-susceptibility measurements.The material undergoes a superconducting transition at 2.46 K and a magnetic transition at 0;23 K. The absence of reentrant behavior shows that the magnetically ordered state is coexistent with the superconductivity. A combined analysis of all the data gives the cubic crystalline electric-field parameters 8'= -12 K and x = -0.65, implying that the ground state of the Yb + ion in PdqYbSn is a I 7 magnetic doublet.
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