Fizika Nizkikh Temperatur: Volume 47, Number 11 (November 2021), p. 1061-1071 ( to contents , go back )
Optical spectroscopy study of KDy(WO4)2: Crystal-field levels of Dy3+ and the Jahn–Teller transition
S. A. Klimin
Institute of Spectroscopy of the Russian Academy of Sciences, Troitsk, Moscow 108840, Russia
A. V. Peschanskii
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Kharkiv 61103, Ukraine
Received July 15, 2021, published online September 24, 2021
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 6H15/2 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.