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Restricted Validity of the Two-State Model Describing a Vibronic EPR g-Factors Averaging in Cs_{2}Zn(SO_{4})_{2}·6H_{2}O Tutton Salt Crystals Doped with Cu^{2+} Ions

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Hoffmann S., Kaszyński R., Augustyniak M., Hilczer W.

Acta Physica Polonica A

1999

vol. 96

issue 6

733-740

Single crystals and powder EPR spectra of Cu^{2+} ions in Cs_{2}Zn(SO_{4})_{6}·6H_{2}O were recorded in the temperature range of 4.2-300 K and the g-factor temperature variations were determined. The g_{z} and g_{y} have the values of 2.443 and 2.134, respectively, at the rigid lattice limit below 20 K, and then continuously tend to an average value on heating. This vibronic averaging produced by reorientations of Cu(H_{2}O)_{6}-complexes between Jahn-Teller distorted octahedral configurations is described in terms of a two-state Silver-Getz model which is known as a good model for diamagnetic non-ammonium Tutton salts. We found, however, that this model is only a crude approximation in Cs_{2}Zn(SO_{4})_{6}·6H_{2}O below 150 K. Above this temperature the model works better and describes the vibronic dynamics between the two lowest energy potential wells in the adiabatic potential surface differing in the energy of δ_{12}=318(9) cm^{-1}=3.7 kJ/mol.

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1 Acta Physica Polonica A

1 1999

1 Augustyniak M.

1 Hilczer W.

1 Hoffmann S.

1 Kaszyński R.

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Restricted Validity of the Two-State Model Describing a Vibronic EPR g-Factors Averaging in Cs_{2}Zn(SO_{4})_{2}·6H_{2}O Tutton Salt Crystals Doped with Cu^{2+} Ions