Deviations from the Curie Law Zero-Field Splitting

2 Deviations from the Curie Law Zero-Field Splitting 

Eor molecules of lower than cubic symmetry with more than one unpaired electron i.e. S Vi), coupling to excited states through spin-orbit coupling can break the degeneracy of the states even in the absence of an applied field. This phenomenon, known as zero-field splitting, in turn will lead to deviations from the Curie law. The behaviour of an 5 = 1 system will serve as an illustration. The form of the Hamiltonian is  

It is a relatively simple matter of plugging in these six values into the Van Vleck equation to obtain Details of the derivation of the perpendicular 

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