Observation of unusual slow-relaxation of the magnetisation in a Gd-EDTA chelate

Abstract

A Gadolinium EDTA chelate displays characteristic isotropic behaviour common of Gd^III complexes under zero applied magnetic field, and anisotropic behaviour arising from dipolar coupling and weak spin–phonon coupling under an applied magnetic field. This surprising magnetic behaviour for Gd^III is investigated using SQUID magnetometry and rationalized through theoretical calculations.