Microstructure of pair centers of Cr3+-Cr2+ ions in the KZnF3 crystal |
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Authors: | M V Eremin S I Nikitin N I Silkin S Yu Prosvirin R V Yusupov |
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Institution: | (1) Kazan State University, 420008 Kazan, Russia |
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Abstract: | Studies involving the piezospectroscopy method have shown that the symmetry of the pair centers of Cr3+-Cr2+ ions in the KZnF3 crystal is tetragonal. In this paper we develop a microscopic model of a pair center. We use the temperature dependence of
the integrated intensity of the absorption line to find the effective hopping integral for an e
g electron, t
σσ=205 ± 10 cm−1, and the polaron reduction factor, equal to 0.11. By analyzing the selection rules for exchange-induced electric dipole transitions
under double-exchange conditions we identify all the absorption lines of Cr3+-Cr2+ pairs.
Zh. éksp. Teor. Fiz. 114, 1421–1429 (October 1998) |
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