Spin-phonon and lattice contributions to the ground-state splitting of Gd3+ and Eu2+ in scheelite crystals

Abstract

The EPR spectra of Gd 3+ in CaWO 4 single crystals have been studied at temperatures T = 1.8, 4.2, and 114-300 K, and the temperature dependence of the parameters (T) of the spin Hamiltonian has been found. The behavior of (T) has been analyzed. The spin phonon and static lattice contributions (F) and