Abstract
Three superconducting compounds are known at present in the Tl–Ba–Ca–Cu–O system: Tl2Ba2CuO6+y, Tl2Ba2CaCu2O8+y, and Tl2Ba2Ca2Cu3O10+y, known by their cation numbers as '2201', '2212' and '2223', respectively1–3. The transition temperature Tc increases in this series, from 80 to 110 to 120 K, as the number of CuO2 layers in the unit cell increases from one to three. Here we report the synthesis and characterization of a new Tl–Ba-Ca–Cu–O superconductor which differs from these three in having only a single thallium layer (instead of two) per unit cell, but which has four CuO2 layers. The composition of the phase is TlBa2Ca3Cu4O11 (1234) and its structure is tetragonal, with lattice constants a = 3.85 Å and c = 19.1 Å.
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Ihara, H., Sugise, R., Hirabayashi, M. et al. A new high-Tc TlBa2Ca3Cu4O11 superconductor with Tc >120K. Nature 334, 510–511 (1988). https://doi.org/10.1038/334510a0
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DOI: https://doi.org/10.1038/334510a0
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