First Observation of Orthorhombic Jahn-Teller EPR Spectraudin Cu(II) doped (NH4)2Cd2(SO4)3 (ACS) Single Crystals. Paper I

摘要

Since the first experimental confirmation of axial Jahn-Teller effect in Cu(II) doped ZnSiF6.6H2O in 1950, theudOrthorhombic Jahn-Teller Effect (OJTE) in solids has not been clearly observed experimentally even though a lot ofudconjectures have been made. This is the first report of experimental observation of orthorhombic Jahn-Teller EPR spectra 2EudCu(II) ion in cadmium ammonium sulphate crystal providing the direct confirmation of the OJTE. The spectra correspond toudall the three Jahn-Teller potential well minima being non-equivalent in energy. The detailed theoretical analysis (not reportedudhere) of the spectra led to evaluation of many spectroscopic parameters and their temperature dependence, suggestingudpotential applications of such systems.