The magnetic behaviour of titanium and vanadium hexaurea salts at low temperatures

Abstract

The magnetic susceptibility and anisotropy of the iodide and perchlorate salts of the hexaureatitanium(III) and hexaureavanadium(III) ions have been measured between liquid helium and ambient temperatures. The analysis of the data in terms of a model involving the angular and radial parts of the ligand field parameters, B^0/₂, B^0/₄ and B^3/₄, the spin-orbit coupling constant, λ, and the orbital reduction parameter, k, yields values supporting earlier studies, but having greater reliability and in better agreement with the optical absorption spectra. It is suggested that the low values deduced for k and λ/λ₀ may be due to the operation of a dynamic Jahn-Teller effect.