Temperature and field dependence of the critical current densities of Y-Ba-Cu-O films

Allen, L. H.; Broussard, P. R.; Claassen, J. H.; Wolf, S. A.
October 1988
Applied Physics Letters;10/3/1988, Vol. 53 Issue 14, p1338
Academic Journal
We have prepared thin films of Y1Ba2Cu3O7-x using a coevaporation technique and measured their critical current densities as a function of both temperature and field using a transport technique. For a stoichiometric composition we find that Jc at 4.2 K in zero field is 1.04×106 A/cm2 and does not drop below 105 A/cm2 until T>60 K. Fitting the data near Tc shows that Jc follows a power law of (1-t), with t being the reduced temperature. In an applied field perpendicular to the film’s surface, Jc also drops slowly, and up to 90 kOe Jc >105 A/cm2 for T=4.2 K. Measurements for an off-stoichiometric film, Y1Ba3 Cu2O7-x, give lower Jc values that fall off faster in temperature than for stoichiometric compositions.


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