Dynamic Orbit-Lattice Interactions for PbF2:Gd3+ Single Crystals |
| J. Kuriata, T. Rewaj Institute of Physics, Technical University of Szczecin, Al. Piastów 17, 70-310 Szczecin, Poland and N. Guskos Department of Physics, University of Athens, Solonos Str. 104, 10677 Athens, Greece |
| Received: May 4, 1990; in revised form November 5, 1990 |
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| Temperature dependence of the second-order spin-lattice coefficients for PbF2:Gd3+ 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 4f7 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 ωE is properly chosen. Both models of parametrization show that the Γ3g vibrating mode couples to the 4f7 electrons much weaker than the Γ5g one. |
| DOI: 10.12693/APhysPolA.79.531 PACS numbers: 76.30.Kg |