Optical spectroscopy study of KDy(WO4)2: Crystal-field levels of Dy3+ and the Jahn

Transmission spectra of a double potassium-dysprosium tungstate KDy(WO₄)₂ single crystal in the region of intermultiplet transitions of the Dy³⁺ ion and the Raman spectra of light scattering on the electronic levels of the ⁶H_15/2 ground multiplet of Dy³⁺ are studied in a wide temperature range. The energy scheme for the crystal-field (CF) levels of Dy³⁺ in KDy(WO4)2 is created. The phase transition at the temperature 6.3 K is accompanied by the lowering of the energy of the ground Dy³⁺ CF state, which is evidenced by both the transmission and Raman spectroscopies. Splitting of the low-lying (~13 cm^–1) first excited CF level of the Dy³⁺ ion indicates the simultaneous structural phase transition. The role of Davydov interaction is discussed.

Key words: KDy(WO₄)₂ crystal, Jahn–Teller effect, IR spectroscopy, Raman spectroscopy, Dy³⁺ crystal-field levels.

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Optical spectroscopy study of KDy(WO4)2: Crystal-field levels of Dy3+ and the Jahn–Teller transition

Optical spectroscopy study of KDy(WO₄)₂: Crystal-field levels of Dy³⁺ and the Jahn–Teller transition