Abstract
THE search for new copper oxide superconductors1 has been pursued mainly by exploring a range of chemical compositions (counter-cations and oxygen content) and reaction temperatures. We have explored the effects of an additional variable, the reaction pressure, and have thereby synthesized some new compounds, including (Ca1-ySry)1-xCuO2 which shows superconductivity at 110 K (refs 2, 3). Here we report the synthesis of a new family of high-pressure phases with the formula Srn+1CunO2n+1+δ (n = 1, 2, 3,...) extending from Sr2CuO3.1, (n = 1) to SrCuO2 (n = ∞ )4. Sr2CuO3.1 and Sr3Cu2O5+δ′ (n=2) are superconductors with transition temperatures (Tc ) of 70 and 100K, respectively. The metal sublattice of Sr2CuO3.1, is of the tetragonal K2NiF4 (or Nd2CuO4) type with lattice constants a = 3.764 Å and c-12.548 A, and iodometric measurements suggest that nearly half of the oxygen atoms are missing from the counter-layers to Sr2O1.1. Homogeneous pyramidal or the oxygen atoms are missing from the counter-layers to Sr2O1.1. Homogeneous pyramidal or octahedral coordination, which has generally been believed to be indispensable to attain Tcs of ∼100 K, is thus absent. The n = 2 and 3 members seem to correspond to the high-pressure phases in the Ca–Sr–Cu–O system recently reported by Adachi et al.5.
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References
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Hiroi, Z., Takano, M., Azuma, M. et al. A new family of copper oxide superconductors Srn+1CunO2n+1+δ stabilized at high pressure. Nature 364, 315–317 (1993). https://doi.org/10.1038/364315a0
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DOI: https://doi.org/10.1038/364315a0
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