Superconductivity in single crystals of the nonperovskite-like cuprate Ba2Cu3O6−x |
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Authors: | S. V. Moshkin S. I. Goloshchapov O. V. Frank-Kamenetskaya I. I. Bannova T. I. Ivanova T. N. Kaminskaya M. A. Kuz’mina M. Yu. Vlasov |
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Affiliation: | (1) St. Petersburg State University, St. Petersburg;(2) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg |
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Abstract: | Spontaneous crystallization from a solution in a melt at a pressure of (0.8–1)×10−3 Pa was used to obtain single crystals of a new nonperovskite-like superconducting phase Ba2Cu3O6−x space group P ccm, a=13.065, b=20.654, and c=11.431 Å). The superconducting properties of the crystals were investigated by modulated microwave absorption. The superconducting transition temperatures were 5 K (sample No. 1), 7 K and 13 K (sample No. 2). The superconductivity in the Ba2Cu3O6−x crystals is attributed to the presence of CuO2 chains of edge-sharing copper-oxygen squares. Nonperovskite-like Ba2Cu3O6−x crystals are a new class of one-dimensional (1D) superconductors. Pis’ma Zh. Tekh. Fiz. 23, 27–34 (December 26, 1997) |
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