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1

Parametrization of the Vibronic Contributions to the b^{0}_{4} Spin-Hamiltonian Parameters for ^{8}S_{7/2} Ground State Ions in Fluoroperovskites

100%

Rewaj T., Kuriata J., Typek J., Buzare J.

Acta Physica Polonica A

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1993

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vol. 84

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issue 6

1143-1149

EN

Parametrization of phonon induced contributions to the experimentally determined temperature dependence of the b_{0}^{4} spin-Hamiltonian parameter for Gd_{3+} doped RbCaF_{3}, CsCaF_{3}, RbCdF_{3} and TlCdF_{3} single crystals is discussed. Three physically different parametrization schemes are considered, i.e. that of Einstein, Debye and Huang. It is found that the model of Huang, which predicts that the phonon induced contributions should be proportional to the Debye-Waller factor, describes best the experimental data. The method allowing determination of the Debye temperature from EPR data is also suggested.

2

Dynamic Orbit-Lattice Interactions for PbF_{2}:Gd^{3+} Single Crystals

100%

Kuriata J., Rewaj T., Guskos N.

Acta Physica Polonica A

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1991

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vol. 79

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issue 4

531-541

EN

Temperature dependence of the second-order spin-lattice coefficients for PbF_{2}:Gd^{3+} is reported. It is shown that the thermal expansion of the crystal lattice contributes only in about 14 % to the observed dependence and the rest should be ascribed to a dynamic coupling between the 4f^{7} electrons and lattice vibrations. The results are parametrized in both the Einstein and the Debye models and it is shown that the phenomenological parameters obtained from such parametrization can be made to coincide in both models if a specific value of the Einstein frequency ω_{E} is properly chosen. Both models of parametrization show that the Γ_{3}_{g} vibrating mode couples to the 4f^{7} electrons much weaker than the Γ_{5}_{g} one.

3

Spin-Phonon Contributions to the b^{0}_{2} Parameter for Gd^{3+} in RbCdF_{3} Single Crystals

100%

Guskos N., Kuriata J., Rewaj T.

Acta Physica Polonica A

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1992

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vol. 81

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issue 6

659-665

EN

Temperature dependence of the b^{0}_{2} spin-hamiltonian parameter for Gd^{3+} in RbCdF_{3} single crystals is described. The dependence is interpreted in terms of the 4f^{7} electrons coupling to the whole phonon spectrum of the crystal. The presented data give also an insight into the dynamics of charge compensators causing a tetragonal distortion of the crystal field.

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3 Acta Physica Polonica A

1 1993

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3 Kuriata J.

3 Rewaj T.

2 Guskos N.

1 Buzare J.

1 Typek J.

Parametrization of the Vibronic Contributions to the b^{0}_{4} Spin-Hamiltonian Parameters for ^{8}S_{7/2} Ground State Ions in Fluoroperovskites

Dynamic Orbit-Lattice Interactions for PbF_{2}:Gd^{3+} Single Crystals

Spin-Phonon Contributions to the b^{0}_{2} Parameter for Gd^{3+} in RbCdF_{3} Single Crystals