Abstract
Single crystals of Zn- and Ni-substituted YBa 2Cu 4O 8 with T c=80–20 K for Zn and T c=80–0 K for Ni have been grown from a BaO–CuO flux at 1090°C under 600 bar of O 2. Crystals grown in yttrium stabilized ZrO 2 crucibles do not show contamination from the crucible material. The effective distribution coefficients for Zn and Ni are 0.3 and 1, respectively. The solubility limits are around 2% for Zn and above 6.5% for Ni. Single-crystal X-ray diffraction is used to characterize the crystal quality but it lacks the sensitivity to conclusively differentiate the site preference for small amounts of substituted ions. All crystals show sharp superconducting transitions with Δ T c gradually increasing with decreasing T c.
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