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Growth of high-temperature superconductor crystals from flux

  • International Conference On Superconductivity—I
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Abstract

Crystallization of high-temperature superconductors was studied in La-Sr-Cu-O, Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O systems. Platelet crystals YBa2Cu3O6.5+x were obtained by spontaneous crystallization from homogeneous nonstoichiometric melts enriched in barium and copper oxide. La2−x Sr x CuO4 was prepared by slow cooling of melts enriched in copper oxide. Bi2(Sr,Ca) n + 1Cu n O y , (n=1; 2) was obtained by melting zone travelling. The crystals show transition to superconducting state atT=93 K, ΔT 0.2–0.5 K (Y, Ba cuprate),T=87 K, ΔT 2K (Bi, Sr, Ca-cuprate). La, Sr-cuprate single crystals obtained by Czochralski method did not show transition to superconducting state. For flux-grown crystalsT c was 5–26 K depending on the composition, growth and heat treatment. The short characterization of some accessory phases (Ba3Y2Cu3PtO10, Ca1.75Sr1.5Cu0.75PtO6, BaCuO2, Ba41Cu44O84Cl2) is reported.

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Authors and Affiliations

  1. Institute of Crystallography, Academy of Sciences of the USSR, 117333, Moscow, USSR

    L N Demianets, A B Bykov, O K Melnikov & S M Stishov

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  1. L N Demianets
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  2. A B Bykov
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  3. O K Melnikov
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  4. S M Stishov
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Demianets, L.N., Bykov, A.B., Melnikov, O.K. et al. Growth of high-temperature superconductor crystals from flux. Bull. Mater. Sci. 14, 415–422 (1991). https://doi.org/10.1007/BF02747350

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