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A theory for the magnetic behavior of distorted tetrahedra of magnetically coupled spin 1/2 atoms is derived using the assumptions of (i) isotropic coupling; and (ii) a linear relationship between the coupling constants and interatomic distances. It is found that the theory provides the basis for a model of the magnetic behavior of complexes of the form Cu4OX6L4 which involves dynamic or fluxional distortions. The new model is found to be in several respects more satisfactory than either the anisotropic or the intercluster exchange models proposed previously.
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Jones et al. (1983) studied this question.
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