Local Transition of MnO 4 2 − Molecular Impurity Ion in Proper Ferroelastic K 3 Na(CrO 4 ) 2 (original) (raw)

Ferroelectrics, 2007

Abstract

Temperature dependences of EPR spectrum for Mn paramagnetic center embodied in MnO4 molecular impurity ion in proper ferroelastric K3Na(CrO4)2 were studied. Local transition due to local electron-lattice instability appearing at low temperature region T ≤ 18 K has been detected and identified for this system in the first time. Model of the phenomenon is based on the transformation of Jahn-Teller effect to pseudo-Jahn-Teller effect with its the following complete suppressing under the action of ferroelastic order parameter increase at low temperatures.

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