single ion magnets magnetic properties 3 molecular magnetism 3 point charges model 3 Comment 2 Journal Article 2 Letter 2 mehr ... coordination chemistry 2 crystal field Hamiltonian 2 Research Support, Non-U.S. Gov't 1 crystal field parameters 1 lanthanoid complexes 1 lanthanoids 1 ligand field 1 magnetic anisotropy 1 magnetometry 1 rare earths 1 single-molecule magnets 1 spin Hamiltonian 1 weniger ...