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(a) A schematic image of the crossover in pinning centers between the VG and the BG. Cross-sectional TEM images of the (b) film, (c) ML, and (d) SL.
Angular dependences of at in the SL, and MLs, film, and pure YBCO film.
(a) curves at in the pure YBCO in temperatures of 82.6, 82, 81.4 , 80.8, 80.2, 79.6, 79, 78.4, and . An inset shows as a function of at , 81.4 , 80.2, and . (b) The scaling results of the curves in the pure YBCO, , ML, and SL at .
(a) values and (c) , , and values as a function of the layer thickness in the at 2, 4, and . (b) values and (d) , , and values as a function of the YBCO layer thickness in the MLs at 2, 4, and . Here, and are given by and , respectively.
, , and values at 4 and in the films which are typical of systems 1—6 in Fig. 1(a).
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