Low Temperature Physics: 47, 973 (2021); https://doi.org/10.1063/10.0006579
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
E-mail: klimin@isan.troitsk.ru

A. V. Peschanskii

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
pos Анотація:914

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.

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