Electrical and Magnetic Properties of CuEu2W2O10 and Cu3Eu2W4O18
Magnetic susceptibility measurements showed both a weak response to magnetic field and a lack of the Curie-Weiss region for CuEu2W2O10 and Cu3Eu2W4O18 tungstates characteristic for the multiplet widths comparable to thermal energy. Magnetization measurements displayed the linear temperature dependence with the lower magnetic moment for Cu3Eu2W4O18 in comparison with CuEu2W2O10, indicating that the effect of the electric charges associated with the surrounding ligands can change the multiplet width of individual states. It is affecting the electrical properties of examined tungstates which reveal the insulating state and low relative permittivity εr ~ 29 in case of CuEu2W2O10 and the thermally activated p-type electrical conduction for Cu3Eu2W4O18 with the activation energy of 1.11 eV and the large value of εr ~ 217 above the room temperature.
Yuriy Verbovytskyy and António Pereira Gonçalves
P. Urbanowicz et al., "Electrical and Magnetic Properties of CuEu2W2O10 and Cu3Eu2W4O18", Solid State Phenomena, Vol. 194, pp. 104-107, 2013