Abstract
A method is developed to determine the symmetry properties of strains and the type of Jahn–Teller effect in crystals with impurity ions in a triply degenerate electronic T state. This method is based on a calculation of the isothermal contribution of the impurity subsystem to the elastic moduli of a crystal and the absorption and velocity of normal modes for all three possible problems, namely, T ⊗ e, T ⊗ t2, and T ⊗ (e + t2). The calculation results are compared with experimental data. The efficiency of the method is demonstrated for a CdSe:Cr2+ crystal. The CrSe4 center is found to be described in terms of the problem T ⊗ e. The parameters of the ground-state adiabatic potential are determined.
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Funding
This work was supported by HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL); the Russian Foundation for Basic Research (project no. 18-02-00332a; and the Radiation and Nuclear Technologies Superiority Center of Ural Federal University; and the state assignment of the Ministry of Education and Science of the Russian Federation (theme “Electron” no. АААА-А18-118020190098-5).
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This work was based on our report for the XXXVIII Conference on Low-Temperature Physics (NT-38).
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Translated by K. Shakhlevich
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Averkiev, N.S., Bersuker, I.B., Gudkov, V.V. et al. Ultrasonic Determination of the Jahn–Teller Effect Parameters in Impurity-Containing Crystals. J. Exp. Theor. Phys. 129, 72–80 (2019). https://doi.org/10.1134/S1063776119060104
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DOI: https://doi.org/10.1134/S1063776119060104