The Raman scattering investigation of the features of low-energy electronic excitations of the terbium ion in the KTb(WO4)2 crystal

• Published in: Low temperature physics (Woodbury, N.Y.) N.Y.), 2012-06, Vol.38 (6), p.481-488
• Main Authors: Peschanskii, A. V., Fomin, V. I., Yeremenko, A. V.
• Format: Article
• Language: English
• ISSN: 1063-777X; 1090-6517
• DOI: 10.1063/1.4723666

Raman scattering of light in the KTb(WO4)2 single crystal is investigated in the frequency range of 3–950 cm−1 at 5 K. The ground multiplet 7 F 6 of Tb3+ ion is split by the crystal field with symmetry C 2, and all the multiplet components are detected. It is found that the first excited electronic quasidoublet consists of two singlet levels of different symmetry and is separated from the ground quasidoublet by ∼75 cm−1. Behavior of all the detected levels is investigated in external magnetic fields H ⊥ C 2 and H || C 2. Spectroscopic splitting factors are determined for the ground and excited levels of the Tb3+ ion in the KTb(WO4)2 crystal. Experimental data support the view that at low temperatures the case of Ising anisotropy is realized, and the crystal under study should be considered as a system of two-level magnetic ions.