New series of layered cuprates (ACuO{sub 2.5}){sub 2}(ATiO{sub 3}){sub m}: Dy{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 2}Ti{sub 4}O{sub 17}, m=4
- Univ. of Tokyo (Japan)
- Northwestern Univ., Evanston, IL (United States)
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.
- OSTI ID:
- 420901
- Journal Information:
- Journal of the American Chemical Society, Vol. 118, Issue 37; Other Information: PBD: 18 Sep 1996
- Country of Publication:
- United States
- Language:
- English
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