Isotropic and anisotropic exchange interactions in the Orbitally degenerate excited (4 A 2×2 T 2) state of a Cr3+ ion pair possessing D 3h symmetry |
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| Authors: | V. V. Bannikov V. Ya. Mitrofanov |
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| Affiliation: | (1) Institute of Metallurgy, Ural Division of Russian Academy of Sciences, Yekaterinburg, 620016, Russia |
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| Abstract: | Experimentally observed optical absorption spectra of isolated pairs of chromium ions in Cs3Cr2Br9 corresponding to transitions of pairs from the ground (4 A 2×2 A 2) state to a singly excited (4 A 2×2 T 2) state are theoretically interpreted. It is shown that the position of the exchange multiplets in the excited (4 A 2×2 T 2) state is determined mainly by the resonance exchange interactions removing the degeneracy with respect to the exchange by an excitation within the pair. It is established that the observed fine structure of the pair in the (4 A 2×2 T 2) state is due to a superposition of the contributions from the one-and two-center spin-orbit interaction and resonance antisymmetric exchange. |
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