Lay summary
This project concerns the study of compounds containing orbitally degenerate or quasi-degenerate transition metal ions such as high-spinMn(III) and Co(II) ions in octahedral or quasi-octahedral ligand environments, and rare-earth Tb(III) and Dy(III) ions with first-order orbital angular momenta. Three classes of compounds of current interest will be investigated: 1) 3d-4f Single Molecule Magnets (SMMs), 2) hexa-amine fluoromanganates(III), and 3) valence-tautomeric compounds.Experimental characterization of these systems, primarily using Inelastic Neutron Scattering (INS) technique, High-Field Multi-Frequency EPR (HFMF EPR), far infra-red spectroscopy, and time-resolved extended X-ray absorption fine structure (EXAFS) technique will be complemented by the comprehensive theoretical description of the single ion anisotropy, orbitally-dependent superexchange, vibronic and elastic interactions, and the cooperative Jahn-Teller effect.