Effective Ru moment in RuSr2Eu28722;xCexCu2O10 from high-temperature magnetic susceptibility

BUTERA, ALEJANDRO; VASQUEZ MANSILLA, MARCELO; FAINSTEIN, A.; WILLIAMS, G. V. M.

San Carlos de Bariloche, Argentina

Workshop; 5º Latin American Workshop on Magnetism, Magnetic Materials and their Applications; 2001

Laboratorio de Resonancias Magnéticas, Centro Atómico Bariloche

We have made high-temperature (250 K<T<800 K) DC susceptibility measurements in the compounds RuSr2Eu2−xCexCu2O10 for x=0.6,0.8, and 1.0 in order to determine the Ru effective magnetic moment. After carefully subtracting all contributions to the magnetic susceptibility except that of the Ru ions, we have been able to fit the Ru susceptibility with a law ÷Ru=÷0+CRu/(T−ÈRu). We have found that the Ru effective moment falls between the values expected for Ru5+ in spin states and . We have also found a dependence of ìeff(Ru) and ÈRu with the Ce content x.