J. Phys. IV France 7 (1997) C2-1077-C2-1079
Oxidation State of the Unusual Rare Earth (R= Ce, Pr and Tb) in Double-Layer High-Tc SuperconductorsU. Staub1, L. Soderholm2, S. Skanthakumar2 and M.R. Antonio2
1 Swiss Light Source Project, P. Scherrer Institute, 5232 Villigen PSI, Switzerland
2 Chemistry Division, Argonne National Laboratory IL 60439 Argonne, U.S.A.
X-ray absorption and magnetization experiments are used to describe the oxidation states of the rare earth ions R=Ce, Pr and Tb in the double layer high-Tc superconducting series RBa2Cu3O7 and Pb2Sr2R1-xCaxCu3O8. We obtained the same oxidation states for the rare earths in these two classes of compounds, namely, R=Ce tetravalent and R=Pr and Tb trivalent.
© EDP Sciences 1997