Highly oriented Tl2Ba2Ca2Cu3O10 thin films by pulsed laser evaporation

Liou, S. H.; Aylesworth, K. D.; Ianno, N. J.; Johs, B.; Thompson, D.; Meyer, D.; Woollam, John A.; Barry, Colleen
February 1989
Applied Physics Letters;2/20/1989, Vol. 54 Issue 8, p760
Academic Journal
We have fabricated superconducting thin films on MgO(100) substrates with nearly pure Tl2Ba2Ca2Cu3O10 (2:2:2:3) phase using pulsed laser evaporation and post-annealing. The films had c axes perpendicular to the substrates. Superconducting films with onset temperatures of 125 K and zero resistance at 110 K were obtained. X-ray microprobe fluorescence measurements indicate that a typical composition of films is Tl0.66Ba1.77Ca1.46Cu3Ox, which is low in Tl compared to that expected for the 2:2:2:3 phase. A typical grain size is greater than 10 μm as revealed by scanning electron microscopy.


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