EPR properties of KY(WO4)2 single crystals weakly doped with Er, Yb and Nd

Well oriented KY(WO4)2 single crystal weakly doped simultaneously with Er, Yb and Nd have been investigated using EPR technique. Angular dependencies of the EPR lines clearly confirm C2 symmetry of all: Er3+, Yb3+ and Nd3+ dopants. Basic parameters of the spin Hamiltonian, including Zeeman and hyperfine terms (g and A matrices) as well the spatial orientation between principal axes system and crystallographic axes system were determined.

► Extremely low concentration of Nd, Yb, Er ions was introduced to KY(WO4)2 simultaneously.
► EPR spectra were analyzed to describe their local symmetry in the crystal.
► All the ions substitute for Y ion at C2 point symmetry as isolated entities.
► Principle values of g and A matrices from spin Hamiltonian were determined.