Abstract
We have investigated the structural, electrical, magnetic, and point defect properties of the quadruple-perovskite family Ln{sub 2}Ba{sub 2}Cu{sub 2}M{sub 2}O{sub 11}; (Ln = La-Tb, M = Ti, Sn) as a function of the constituent Ln and M atoms. Superconductivity has not been observed in this system, to date, probably because of both the relatively long in-plane Cu-O distance (>= 1.94 A), which prevents interaction between Cu-3d and O-2p orbitals, and limited doping by alkaline earth substitution for the rare earth constituents. In order to understand the lack of superconductivity in these layered copper titanates, we have focused our attention on related materials with in-plane Cu-O bond distances more amenable to hole-doped superconductivity. 11 refs., 2 figs.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call