Superconductivity in Rare Earth Cuprate Perovskites
Superconducting cuprate perovskites isostructural with Ba2YCu3O7 incorporating a variety of rare earth ions are reported. Resistivity and magnetic susceptibility measurements show transition temperatures in excess of 90K for several materials, including Nd, Sm, Gd, Dy, Ho, Er and Lu-containing phases. Interestingly, Ce and Tb, with a readily accessible 4+ state, form phases other than the defect perovskite which are not superconductors. However, Pr, which also has an accessible 4+ state, does give a nonsuperconducting defect perovskite isostructural with Ba2YCu3O7. The observation of high temperature superconductivity in phases containing ions carrying magnetic moments is significant because it suggests that the magnetic moment on the rare earth ion interacts only weakly with the electrons making up the band crucial to superconductivity in these materials.
MSU Digital Commons Citation
Schneemeyer, Lynn; Waszczak, Joseph V.; Zahorak, S. M.; van Dover, Robert B.; and Siegrist, Theo, "Superconductivity in Rare Earth Cuprate Perovskites" (1987). Department of Chemistry and Biochemistry Faculty Scholarship and Creative Works. 294.