Abstract
The structure and local properties of a nonlinear microwave response of YBa{sub 2}Cu{sub 3}O{sub 7-x} block films, as well as microbridges of these films, are studied using low-temperature scanning microscopy. Correlation between the halfwidth of the temperature dependence of the third harmonic power W{sub TH} and the curve of the electron-beam induced voltage W{sub EBIV} is observed for the medium size of the block. A theoretical model is proposed, which demonstrates that the nonlinear microwave response for large blocks is determined by intrablock pinning of Abrikosov vortices; for blocks of smaller size, the response acquires an additional contribution associated with pinning of hypervortices on the Josephson network of the boundaries between the blocks.
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