Abstract
It is found that perfect Bi2Sr2−x La x CuO6+δ single crystals with the same concentrations of lanthanum x = 0.64 and excess oxygen δ = 0.237 exist in two types. Single crystals of the first type are obtained by slow cooling (the synthesis time is 90–105 h). They have a monoclinic superlattice and exhibit no superconducting transition down to 2 K. Crystals of the second type are obtained by rapid cooling (the synthesis time is 30–40 h) and are characterized by a orthorhombic superlattice and T c = 18 K. Thus, the superconducting transition temperature is determined not only by the concentration of carriers but also by the configuration of defects. A rhombic superlattice prevails in single crystals obtained by slow cooling in the lanthanum concentration range x = 0.3–0.5, while a monoclinic superlattice dominates in the range x = 0.75–0.85. This fact explains the high values of T c at optimal doping (x = 0.4) and the absence of high-T c superconductivity at p < 0.10.
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Original Russian Text © V.P. Martovitsky, A. Krapf, L. Dudy, 2007, published in Pis’ma v Zhurnal Eksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 6, pp. 349–353.
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Martovitsky, V.P., Krapf, A. & Dudy, L. Existence of two types of perfect Bi2Sr2−x La x CuO6+δ single crystals. Jetp Lett. 85, 292–296 (2007). https://doi.org/10.1134/S0021364007060069
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DOI: https://doi.org/10.1134/S0021364007060069