EPR study of the Jahn-Teller effect of Cu2+ ions in ZnGa2O4
作者： G. A. Petrakovskiĭ , K. A. Sablina , A. F. Bovina , A. D. Vasil’ev , A. M. Vorotynov
DOI: 10.1134/S1063783410110314
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摘要: The Jahn-Teller effect in the ZnGa2O4 spinel single crystal has been investigated using electron paramagnetic resonance of Cu2+ ions temperature range 110–560 K. It shown that copper occupy octahedral sites 16d with cubic symmetry Oh7 (Fd-3m). At T < 560 K, octahedra undergo tetragonal distortions (predominantly tension) and rotation around fourfold axes by angle θ ≈ 2.6°. parameters spin Hamiltonian, which characterize prolate (g‖ = 2.355, g⊥ 2.077, A‖ 116 Oe, Atp 12 Oe) oblate 2.018, 2.246, 75 A⊥ 44 octahedra, have determined. temperatures above static transforms into dynamic spectrum magnetic becomes isotropic g 2.116 (the experimental frequency corresponds to X band).
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