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

• Authors: S. Hoffmann , R. Kaszyński , M. Augustyniak , W. Hilczer
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

63.90.+t; 76.30.-v

Discipline

• 63.90.+t: Other topics in lattice dynamics (restricted to new topics in section 63)
• 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 96
• Issue: 6
• Pages: 733-740

Dates

published

1999-12

received

1999-09-16

Contributors

author

S. Hoffmann

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

R. Kaszyński

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

M. Augustyniak

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

W. Hilczer

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

Identifiers

DOI

10.12693/APhysPolA.96.733