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Etude d'un groupement (Ru3O12)13−en presence de degenerescence orbitale et de couplage spin-orbite

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
41
Issue
5
Identifiers
DOI: 10.1016/0022-3697(80)90182-1

Abstract

Abstract A trinuclear cluster (Ru 3O 12) 13− occurs in the Ba 4NbRu 3O 12, and Ba 4TaRu 3O 12 compounds where the oxydation states of ruthénium are +III and +IV. The exchange interaction between magnetic sites is described by a Hamiltonian, which takes account of the orbital degeneracy of the 2T 2 g ( Ru 3+) and 3T 1 g ( Ru 4+) terms. For these ions, the spin-orbit coupling is the dominant effect and it appears that the low temperature magnetic susceptibility depends essentially on the orbital reduction factor and the distortion of the coordination octahedra. There is apparently no first order perturbation of the ground state due to the interaction between magnetic ions.

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