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• W2036568668 abstract "Critical current density (Jc) was measured inductively at 77.3 K over large-area YBa2Cu3O7−δ (YBCO) films deposited by pulsed laser deposition (PLD) and its behaviour with increasing YBCO film thickness (d) was investigated. Jc was found to decrease exponentially with the film thickness. In the Jc–d curve two regions can be distinguished: a 'thin-film' region with characteristically high Jc and exhibiting a rapid decrease with thickness, and a 'thick-film' region with characteristically lower Jc and exhibiting a slower decay with thickness. The magnetic-field angular dependence of Jc for several YBCO films with thickness ranging from ~0.2 to ~1.6 µm was evaluated. All films exhibited prominent Jc peaks when the applied magnetic field H was oriented along the c-axis of YBCO. The prominent Jc peak at is considered to be due to correlated pinning along extended defects found in dense amounts in the YBCO film: linear defects in the form of screw and edge dislocations, and planar defects possibly in the form of stacking faults. Examination of the microstructure of YBCO revealed a strong dependence of the defect density on film thickness: a higher density of linear defects was found for thinner films whereas planar defects were more abundant for thicker films. The ratio of Jc () to Jc () is generally>1 for films belonging to the thick-film region (typically d≥0.4 µm) and also showed an increase with the density of linear defects. These results suggest that linear defects may be more effective pinning sites than planar defects, or that an overabundance of planar defects may offset the increase of Jc for thicker films. Surprisingly, for films in the thin-film region (d<0.4 µm), the ratio of Jc () to Jc () is ≤1, in spite of a very prominent Jc maximum at as well as a relatively high density of c-axis correlated defects. This deviation suggests that the contribution to Jc in the thin-film region may be attributed principally to random defects, intrinsic pinning, and possibly extended defects parallel to the ab-plane." @default.
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• W2036568668 date "2005-11-04" @default.
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• W2036568668 title "c-axis-correlated pinning mechanism in large-area-PLD YBa2Cu3O7−δfilms: dependence on microstructure and film thickness" @default.
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• W2036568668 doi "https://doi.org/10.1088/0953-2048/18/12/008" @default.
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