Growth and properties of submillimeter single grain Tl2Ba 2Ca2Cu3O10+x superconducting thin films

H. C. Lin*, T. M. Uen, C. K. Liu, Jenh-Yih Juang, Kaung-Hsiung Wu, Y. S. Gou

*Corresponding author for this work

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Distinct crystalline superconducting grains of Tl2Ba 2Ca2Cu3O10+x(Tl-2223) with sizes up to 150 μm×150 μm×1 μm were prepared by a single target dc-sputtering process followed by proper postannealing at temperatures around 910°C. A reactive ion etching process was developed to pattern an ∼10 μm wide bridge with four contact leads directly on a single grain to study its superconducting transport properties. The etching process was found to have only minimal effect on the superconducting transition temperature Tc, which was typically around 110 K. Grains grown on MgO(100) and LaAlO 3(100) substrates, although displaying somewhat different in-plane orientations, all had critical current densities Jc, well above 106 A/cm2 at 77 K. The existence of only one grain boundary, however, can reduce the Jc by orders of magnitude.

Original languageEnglish
Number of pages1
JournalApplied Physics Letters
StatePublished - 1 Dec 1995

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