Thallium barium calcium copper oxide

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Schematic layered structure of TBCCO-2223.

Thallium barium calcium copper oxide, or TBCCO (pronounced "tibco"), is a family of high-temperature superconductors having the generalized chemical formula TlmBa2Can−1CunO2n+m+2.

Tl2Ba2Ca2Cu3O10 (TBCCO-2223) was discovered in Prof.Allen M. Hermann's laboratory in the physics department of the University of Arkansas in October 1987 by the post-doctoral researcher Zhengzhi Sheng and Prof. Hermann.[1] The bulk superconductivity in this material was confirmed by observations of magnetic flux expulsion and flux trapping signals (under zero field cooled and field cooled conditions) with a SQUID magnetometer in the superconductor laboratory of Timir Datta in the University of South Carolina.[2] Allen Hermann announced his discovery and the critical temperature (Tc) of 127 K, in Houston, Texas at the World Congress on Superconductivity organized by Paul Chu in February 1988.


  1. ^ Sheng, Z. Z.; Hermann A. M. (1988). "Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system". Nature. 332 (6160): 138–139. Bibcode:1988Natur.332..138S. doi:10.1038/332138a0. 
  2. ^ Sheng, Z. Z.; Hermann, A.M.; El Ali, A.; Almasan, C.; Estrada, J.; Datta, T.; Matson, R.J. (1988). "Superconductivity at 90 K in the Tl-Ba-Cu-O system". Physical Review Letters. 60 (10): 937–940. PMID 10037895. doi:10.1103/physrevlett.60.937. 
  • Copper Oxide Superconductors:, by Charles P. Poole, Timir Datta, Horacio A. Farach, John Wiley & Sons, 1988, ISBN 0-471-62342-3
  • Superconductivity: Its historical Roots and Development from Mercury to the Ceramic Oxides, by Per Fridtjof Dahl, AIP, New York, 1st ed. 1992, ISBN 0-88318-848-1

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