Abstract
We have developed a method to successfully grow cation-substituted versions of single-crystal YBa 2Cu 3O 7−δ (YBCO). The target composition is Y 0.6Ca 0.4Ba 1.6La 0.4Cu 3O 7−δ. Polycrystalline samples with this composition are known to be less reactive [1]. Reduced reactivity in single-crystal samples will be useful for surface and interface research and applications. We modify a standard 1-4-10 flux method of producing single-crystal YBCO by including the desired cations in the flux. We compare measured Ca:Y and La:Ba ratios in the single crystals to those of stoichiometrically ideal polycrystalline samples. To bring the ratios into agreement with the polycrystalline data, we systematically vary the composition of the flux. We achieve the closest agreement in those crystals whose flux had both relatively high amounts of calcium and relatively low amounts of lanthanum. We find that even when the stoichiometry is not ideal, corrosion resistance is enhanced as compared to YBCO.
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