• DOI:10.1038/332138A0
• Corpus ID: 30690410

Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system

@article{Sheng1988BulkSA,
  title={Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system},
  author={Zhengzhi Sheng and Allen M. Hermann},
  journal={Nature},
  year={1988},
  volume={332},
  pages={138-139}
}

• Z. Sheng, A. Hermann
• Published 1 March 1988
• Physics
• Nature

The discovery of 30-K superconductivity in the La–Ba–Cu–O system1 and 90-K superconductivity in the Y–Ba–Cu–O system2 stimulated a worldwide search for even higher-temperature superconductors. Unfortunately, most of the higher-temperature transitions reported in the past year have proved to be unstable, irreproducible, or not due to bulk superconductivity3–7. Recently, we and co-workers8,9 reported superconductivity above 90 K in a new Tl–Ba–Cu–O system, and pointed out that elemental substitutions in this system may lead to even higher-temperature superconductivity. Here we report stable and reproducible bulk superconductivity with an onset at 120 K and zero resistance above 100 K in the Tl–Ca/Ba–Cu–O system. This transition temperature is much higher than those observed for typical rare-earth-containing superconductors, and the onset temperatures are comparable to that in the Bi–Ca/Sr–Cu–O system, as reported in refs 10 and 11 (received after submission of this paper).