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Abstract
A particular two stage strain relaxation phenomenon on La0.8Ba0.2MnO3 thick films has been observed. A fully strained bottom layer near the film/substrate interface consists of a moderate density of dislocations, while a top layer exhibits a high density of dislocations, becoming denser as it nears the surface of the film. This phenomenon can be attributed to the partial diffusion of the substrate element, Sr, into the bottom layer of the film, which reduces its lattice constant, and to the sudden change of the lattice constants at the bottom-top-layer interface due to the stoppage of Sr diffusion.
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