EPR and optical study of coupled Yb3+ ion pairs in weakly doped LiNbO3:Yb single crystal |
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Authors: | T. Bodziony S. M. Kaczmarek |
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Affiliation: | (1) Institute of Physics, Szczecin University of Technology, Al. Piastów 17, 70-310 Szczecin, Poland |
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Abstract: | The results of electron paramagnetic resonance and optical spectroscopy studies of Yb3+ ions in LiNbO3:1% Yb host crystal are reported. Also some results of Raman spectra measurements are presented. The observed features are assigned to single Yb3+ ions and pairs of dissimilar ions (with different g value) of the type of evenYb3+-evenYb3+. The values of the components of the g-tensor for both ions and interaction exchange tensors are estimated. The value of J = ?0.0283 cm?1 shows that the exchange interactions are of antiferromagnetic nature. The most probably the evenYb3+-evenYb3+ pairs substitute for neighborhood Li+-Nb5+ positions what induces gain of distance between ions of about 1 Å. There are no observed dissimilar ion pairs of the type oddYb3+-oddYb3+. |
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Keywords: | Electron paramagnetic resonance exchange superexchange rare-earth ions ytterbium spin-Hamiltonian parameters |
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