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The magnetic properties and the lattice constants of the rare earth tetraborides RB4 have been determined. The compound PrB4 is ferromagnetic. The compounds in which R represents Nd, Sm, Gd, Tb, Dy, and Ho are antiferromagnetic while ErB4 and YbB4 show metamagnetic behavior. The element Ce and to some extent also the element Yb show an abnormal valency in the tetraborides. The magnetic properties of the RB4 compounds are discussed in terms of the RKKY formalism. It is shown that the ferromagnetic behavior of PrB4 is probably the result of a strong participating of the orbital angular momentum to the indirect exchange coupling between the localized moments.
Buschow et al. (Wed,) studied this question.
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