Eur. Phys. J. B 55, 389-395 (2007)
https://doi.org/10.1140/epjb/e2007-00073-y

EPR of Yb³⁺ ions in a monoclinic KY(WO₄)₂ single crystal

¹ Institute of Physics, Polish Academy of Scences, Al. Lotników 32/46, 02-668, Warsaw, Poland
² A.A.Galkin Physico-Technical Institute, 340114 Donetsk, Ukraine
³ Física i Cristallografia de Materials (FiCMA), Universitat Rovira i Virgili, Campus Sescelades C/ Marcel.lí Domingo, S/N, 43007-, Tarragona, Spain

Corresponding author: ^a borow@ifpan.edu.pl

Received: 28 July 2006
Revised: 21 December 2006
Published online: 22 March 2007

Abstract

The electron paramagnetic resonance (EPR) of Yb³⁺ ions in a KY(WO₄)₂ single crystal was investigated at T=4.2 K and fixed frequency of 9.38 GHz. The resonance absorption observed on the lowest Kramers doublet represents the complex superposition of three spectra, corresponding to the ytterbium isotopes with different nuclear moments. The EPR spectrum is characterized by a strong anisotropy of the g-factors. The temperature dependence of the g-factors is shown to be caused by the strong spin-orbital and orbital-lattice coupling. The resonance lines broaden with increasing temperature due to the short spin-lattice relaxation times.