Paramagnetism of Cu3RE2W4O18 semiconductors (RE = Gd, Dy-Er)

Abstract

Cu3RE2W4O18 tungstates (RE = Gd, Dy Er) are paramagnets in the temperature range 4.2 300 K visible also in the absence of the energy losses in the curve of the imaginary part of magnetic susceptibility, 00. The negative values of the paramagnetic Curie Weiss temperature, , may suggest the weak antiferromagnetic coupling below 4.2 K. The temperature independent component of magnetic susceptibility has a positive value indicating a domination of the Van Vleck contribution. Calculations of the e ective number of the Bohr magnetons revealed that the orbital contribution to the magnetic moment comes mainly from the RE3+ ions.