Abstract
In spite of an overwhelming amount of research work1 triggered by the discovery2 of superconductivity above 90 K in an Y–Ba–Cu oxide, fundamental questions regarding the origin and mechanism of the high-Tc superconductivity in YBa2Cu3O7–δ remain to be answered. Specifically, it has not been decided which of the two Cu sites mainly carries superconducting electrons. As an approach to the problem, we investigated superconductivity in a series of alloyed compounds, YBa2 (Cu1–xMx)3O7–δ with M = Fe, Co, Ni, Zn and Ga, in which metals M are partially substituted for Cu. The electrical resistivity measurements, as well as the X-ray analysis at low temperatures, show that Tc is not sensitive to the orthorhombic-tetragonal phase transition induced by the impurities, thus strongly suggesting that superconductivity along the one-dimensional Cu–O chains is unlikely.
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References
1. Jap. J. appl. Phys. 26, L311–L525; L601–L881 (1987). 2. Wu, M. K. et al Phys. Rev. Lett. 58, 908–910 (1987). 3. Izumi, F. et al Jap. J. appl. Phys. 26, L649–L651 (1987). 4. Maeno, Y. et al. Jap. J. appl. Phys. 26, L774–L776 (1987). 5. Yukino, K. et al. Jap. J. appl. Phys. 26, L869–L870 (1987).
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Maeno, Y., Tomita, T., Kyogoku, M. et al. Substitution for copper in a high-Tc superconductor YBa2Cu3O7–δ. Nature 328, 512–514 (1987). https://doi.org/10.1038/328512a0
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DOI: https://doi.org/10.1038/328512a0
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