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Vibronic Effects in EPR Spectra of (NH_{4})_{2}Cu(BeF_{4})_{2}·6H_{2}0 Single Crystal

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Hoffmann S., Gomółka-Marciniak M.

Angular variations of the g-factors and linewidth value were recorded at X-band, at room temperature, and at 77 K. The temperature dependence of the g-factors was measured along the principal g-tensor axes in the temperature range from 4.2 K to 300 K. The rigid lattice g-factors at 4.2 K are: g_{z} = 2.428, g_{y} = 2.138, and g_{x} = 2.058. The g_{x} value very slowly increases linearly on heating, whereas g_{z} and g_{y} nonlinearly tend towards their average value. This is a typical behaviour of Cu(II) EPR in Tutton salt crystals, however the g(T) dependence is much less pronounced in (NH_{4})_{2}Cu(BeF_{4})_{2}·6H_{2}0 as compared to the Cu(II) doped salts. The results are described in terms of the two vibronic coupling models of the strong Jahn-Teller effect. It is shown that the models are not adequate to describe the vibronic g-factor behaviour in paramagnetic Cu(II) crystals which is attributed to the cooperative Jahn-Teller effect existing in these crystals.

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1 Acta Physica Polonica A

1 1993

1 Gomółka-Marciniak M.

1 Hoffmann S.

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Vibronic Effects in EPR Spectra of (NH_{4})_{2}Cu(BeF_{4})_{2}·6H_{2}0 Single Crystal