EPR study of the dynamic Jahn-Teller effect of Cu2+ in CdBa(HCOO)(4)centerdot 2H(2)O single crystals

Electron Paramagnetic Resonance spectra of Cu2+ doped into cadmium barium f ormate dihydrate single crystal were studied at 300 K. The powder spectrum of this material was studied at 300 to 133 K. The values of the g and A hyp erfine tensors were found to be temperature dependent. The temperature depe ndence of the Cu2+ EPR spectrum is discussed in terms of the dynamic Jahn-T eller effect. The angular variation of the spectra indicates the substituti on of the host Cd2+ with Cu2+. Th, spectra were fitted with a tetragonal sp in-Hamiltonian, the parameters of which were determined at 300 K. The groun d-state wave function of the copper complex has been constructed at 113 K a nd 300 K.