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Low temperature phase formation of Tl-based superconducting thin films in reduced oxygen atmosphere

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4 Author(s)
Wu, C.Y. ; Center for Mater. Res. & Anal., Nebraska Univ., Lincoln, NE, USA ; Foong, F. ; Liou, S.H. ; Ho, J.C.

Tl-Ba-Cu-Cu-O superconducting thin films were prepared by magnetron sputtering with postannealing in a reduced oxygen atmosphere. Single-phase Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ can form on the MgO substrate at 800 degrees C under P(O/sub 2/) approximately=0.1 atm. However, the phase formation temperature can be affected by the starting composition of the film. Tl/sub 1/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ phase can be formed by simply lowering the Tl/sub 2/O pressure. The thermal stability of Tl/sub 1/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ phase was studied by resistivity measurements at high temperatures.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 1 )