Crossover of thickness dependence of critical current density Jc(T,H) in YBa2Cu3O7-δ thick films

Qiang Li; Suenaga, M.; Ye, Z.; Foltyn, S.R.; Wang, H.
May 2004
Applied Physics Letters;5/3/2004, Vol. 84 Issue 18, p3528
Academic Journal
Critical current density Jc as a function of temperature T and magnetic field H was studied for high quality YBa2Cu3O7-δ (YBCO) films with thickness d=0.2, 1, and 3 μm by means of magnetization measurements of a circular disk in perpendicular field. We found that the thickness dependence of Jc(H) for the YBCO thick films crossovers at high fields for T>50 K, where the 0.2-μm-thick film carries significantly lower Jc(H) than the 3-μm-thick film at high fields, even though the zero- or low-field Jc for the 0.2-μm-thick film is more than twice the value for the 3-μm-thick film. © 2004 American Institute of Physics.


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