Abstract
We have investigated the effect of three dopants directed at the oxygen sites in Y1Ba2Cu3O7−δ : sulfur, fluorine, and chlorine. Single-phase material has been obtained up to a (nominal) replacement of ∼1% of the oxygen. Although the lattice parameters are unchanged, all dopants raiseT c (very slightly), sharpen the resistive transition, reduce the normal state resistivity, and very substantially increase the (magnetically determined) fraction of the material that is superconducting. All of these results differ qualitatively from those obtained with dopants directed at other locations in the 123 structure, and it is suggested that small additions of sulfur, fluorine, or chlorine may help to stabilize the ideal 123 stoichiometry.
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Bansal, N.P., Boyne, D. & Farrell, D.E. Doping directed at the oxygen sites in Y1Ba2Cu3O7−δ: The effect of sulfur, fluorine, and chlorine. J Supercond 1, 417–425 (1988). https://doi.org/10.1007/BF00618598
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DOI: https://doi.org/10.1007/BF00618598