Synthesis and Superconductivity of a New High-Tc Tl-Ba-Ca-Cu-O Phase
- 1 June 1988
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 27 (6A), L1050
- https://doi.org/10.1143/jjap.27.l1050
Abstract
A 120 K-class superconductor in the Tl-Ba-Ca-Cu-O system was synthesized, and the flux exclusion proved to be greater than 90% of the perfect diamagnetism. X-ray and electron diffraction studies showed a tetragonal unit cell with lattice parameters a=5.4454(7) Å and c=35.586(9) Å, indicating triple perovskite-like layers interposed between Tl2O2 layers. A structure model is proposed, in which the layer sequence along the c-axis is Tl2O2-BaO-CuO2-Ca-CuO2-Ca-CuO2-BaO. The chemical composition is Tl2Ba2Ca2Cu3O10+x assuming trivalent thallium. If the same average Cu valence as in YBa2Cu3O7 is assumed, this composition requires x=0.5 for oxygen.Keywords
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