Abstract
The ground-state magnetic properties of Ce 0.75La 0.25B 6 and Sm 3Te 4 have been studied by means of static magnetization measurements at very low temperatures T ⩾ 50 mK. In Ce 0.75La 0.25B 6, the H − T phase diagram reveals three different ordered phases: in addition to the two phases (phase II and III) known for CeB 6, a new antiferromagnetic state appears before the antiferro-quadrupolar order sets in. In the valence fluctuation compound Sm 3Te 4, a spin-glass ordering is evidenced at T g ∼ 1.3 K. It is likely that the two valence states (Sm 2+, Sm 3) are randomly frozen at low temperature to form effectively a randomly diluted magnet.
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