Dislocations in charge-ordered Pr0.5Ca0.5MnO3epitaxial thin films prepared by a two-step growth technique

Autor: M.J. Zhuo, X. L. Ma, Youbao Zhang, Zhu Yuying, X. Wang
Rok vydání: 2010
Předmět:
Zdroj: Philosophical Magazine Letters. 90:323-336
ISSN: 1362-3036
0950-0839
DOI: 10.1080/09500831003662503
Popis: Charge-ordered Pr0.5Ca0.5MnO3 (PCMO) thin films epitaxially grown on SrTiO3 (100) substrates were prepared by a two-step growth technique which resulted in a 10 nm thick first layer and a 70 nm thick main layer. The dislocations in the as-received films were investigated using conventional and high-resolution transmission electron microscopy. Pure-edge misfit dislocations with Burgers vectors and line directions were found to be the major interfacial defects responsible for the full misfit relief in the PCMO films. These dislocations constitute a square grid of dislocation lines parallel to the PCMO/SrTiO3 interface. In contrast, two types of dislocations were identified within the first layer. One is of edge type with Burgers vectors and line directions ; the other, of screw type with Burgers vectors and line directions . Cross-slip of the latter may contribute to the multiplication of misfit dislocations necessary for a total misfit relaxation. Few threading dislocations were observed in the main layer....
Databáze: OpenAIRE
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