Enhancement of flux pinning of TFA-MOD YBCO thin films by embedded nanoscale Y2O3

YBCO films with different levels of excess yttrium were prepared on single-crystal LaAlO3 with metal-organic deposition using trifluoroacetates (TFA-MOD). X-ray diffraction and transmission electron microscope measurements revealed excess yttrium in YBCO in the form of nanoscale Y2O3 with (400) pref...

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Bibliographic Details
Published in:Superconductor science & technology 2006-08, Vol.19 (8), p.844-847
Main Authors: Cui, X M, Tao, B W, Tian, Z, Xiong, J, Zhang, X F, Li, Y R
Format: Article
Language:English
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Summary:YBCO films with different levels of excess yttrium were prepared on single-crystal LaAlO3 with metal-organic deposition using trifluoroacetates (TFA-MOD). X-ray diffraction and transmission electron microscope measurements revealed excess yttrium in YBCO in the form of nanoscale Y2O3 with (400) preferred orientation. The field dependence of Jc demonstrated that YBCO films with Y2O3 doping had enhanced Jc in comparison with stoichiometric YBCO films in the magnetic fields. We think the reason for this is that the Y2O3 nanoparticles act as pinning centres. YBCO films with 60% yttrium excess display 43% increased Jc compared to stoichiometric YBCO films at a magnetic field of 1 T.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/19/8/027