The High Tc Tl-Ba-Ca-Cu-O Superconducting System

  • A. M. Hermann
  • Z. Z. Sheng


Discoveries of 30-K La-Ba-Cu-O superconductor [1] and 90-K Y-Ba-Cu-O superconductor [2] have stimulated a worldwide race for new and even higher temperature superconductors. Breakthroughs were made by the discoveries of the 90-K Tl-Ba-Cu-O system [3,4], 110-K Bi-Sr-Ca-Cu-O system [5,6] and 120-K T1-Ba-Ca-Cu-O system [7–9]. Recently, high temperature superconductivity was also observed in the Tl-Sr-Ca-Cu-O system [10–12], and in the M-Tl-Sr-Ca-Cu-O with M = Pb [13,14] and rare earths [15]. In this paper, we present preparation procedures, structure, and some properties of the 120-K Tl-Ba-Ca-Cu-O superconductors. We discuss an unusual levitation phenomenon of the Tl-Ba-Ca-Cu-O superconductor due to flux pinning [16]. Finally, we present a new Tl2O3-vapor-process [17] which allows the highest temperature Tl-Ba-Ca-Cu-O superconductors to be easily made in the forms of complex bulk components, wires and fibers, and thick and thin films, and minimizes problems caused by toxicity and volatility of Tl starting compounds. Recent results on T1203 vapoer-processing of thin film Ba-Ca-Cu-O precursors are included.


High Temperature Superconductor Flowing Oxygen Flux Pinning Quartz Boat Tetragonal Unit Cell 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • A. M. Hermann
    • 1
  • Z. Z. Sheng
    • 1
  1. 1.Department of PhysicsUniversity of ArkansasFayettevilleUSA

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