Abstract
Recently, Sheng and Hermann1 reported the achievement of zero resistance at >100 K in the system Tl–Ca–Ba–Cu–O (TCBCO). Two superconducting phases were immediately identified2 as Tl2CaBa2Cu2O8+δ (2122) and Tl2Ca2Ba2Cu3O10+δ (2223). Here we confirm that zero resistance is achievable above 100 K in 2122–TCBCO synthesized by a fast solid-state reaction, and report a small positive pressure dependence of the transition temperature, as in Bi2CaSr2Cu2O8+δ3.
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References
Sheng, Z. Z. & Hermann, A. M. Nature 332, 138–139 (1988).
Hazen, R. M. et al. Phys. Rev. Lett. (submitted).
Chu, C. W. et al. Phys. Rev. Lett. (in the press).
Hor, P. H. et al. Phys. Rev. Lett. 58, 911–912 (1987).
Chu, C. W., Huang, Z. J., Meng, R. L., Gao, L. & Huang, Z. J. Science 235, 567–569 (1987).
Chu, C. W., Huang, Z. J., Meng, R. L., Gao, L. & Hor, P. H. Phys. Rev. B (submitted).
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Gao, L., Huang, Z., Meng, R. et al. Bulk superconductivity in Tl2CaBa2Cu2O8+δ up to 120 K. Nature 332, 623–624 (1988). https://doi.org/10.1038/332623a0
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DOI: https://doi.org/10.1038/332623a0
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