Synthesis and properties of a 125 K superconductor in the Tl-Ca-Ba-Cu-O system

Gopalakrishnan, I. K.; Sastry, P. V. P. S. S.; Gangadharan, K.; Phatak, G. M.; Yakhmi, J. V.; Iyer, R. M.
August 1988
Applied Physics Letters;8/1/1988, Vol. 53 Issue 5, p414
Academic Journal
A method for the synthesis of a 125 K superconducting phase having a nominal composition TlCaBaCu2 Ox is described. It is shown that by sintering at 1200 K in flowing oxygen containing a controlled amount of water vapor, a zero electrical resistance state (Tcf) at temperatures as high as 125 K can be obtained. A transport critical current density (Jc ) of ∼240 A/cm2 at 77 K was obtained in this 125 K material.


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