Abstract
The bulk magnetic properties of the cubic perovskite material, EuLiH 3, have been investigated and the results strongly suggest that it is a ferromagnet with T c = 38°K and θ c = +40°K. Thus EuLiH 3 is very likely a new semiconducting ferromagnet. The properties of EuLiH 3 are compared with those of EuTiO 3, also a cubic perovskite with a very similar lattice parameter (3·79 Å for EuLiH 3 and 3·90 Å for EuTiO 3) which is, however, antiferromagnetic below 5°K. This somewhat surprising difference is discussed in terms of the molecular field theory and the results of previous work on exchange interactions in divalent europium compounds especially the europous monochalcogenides and europium titanate as well. It is concluded that the major factor influencing the different magnetic behavior of EuLiH 3 and EuTiO 3 is the apparent absence of a negative near-neighbor interaction in the former which is prominent in the latter. It is suggested that this diminution of antiferromagnetic exchange in EuLiH 3 is due to the inability of H − with electron configuration 1 s 2 to participate in super-exchange interactions to the same degree as O 2− with electron configuration (He)2 s 2 2 p 6.
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