Abstract
Following the report of Maeda et al.1 on high-Tc superconductivity in samples of nominal composition BiSrCaCu2Ox we have identified three distinct phases in the homologous series Bi2.1(Ca, Sr)n+lCunO2n+4+δ with n = 1,2 and 3. These have zero resistance Tcs of 80 K, 91 K and 105 K respectively. The structures in the homologous series appear to be based on alternating double bismuth Bi2O2 layers and perovskite (Sr, Ca)O–CuO2 layers, with higher members obtained by intercalating additional 3.1 Å Ca-CuO2 bilayers. The structures can be indexed on a pseudo-tetragonal subcell with a = b = 5.4 Å and c = 24.4 Å (n = 1), 30.76 Å (n = 2) or 36 Å (n = 3). We were unable to prepare the n =4 member. In each structure a 2× superlattice structure in the c-direction arises as a natural consequence of a 19/4 incommensurate structure in the b direction, which accounts for 2.1 Bi atoms in the unit formula. The critical temperature, Tc, for these phases is sharply dependent on the Sr/Ca ratio and oxygen stoichiometry, as determined by heat treatment.
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References
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Tallon, J., Buckley, R., Gilberd, P. et al. High-Tc superconducting phases in the series Bi2.1(Ca, Sr)n+lCunO2n+4+δ. Nature 333, 153–156 (1988). https://doi.org/10.1038/333153a0
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DOI: https://doi.org/10.1038/333153a0
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