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Título

Growth Instabilities as a Source of Surface Chemical Structuration in Functional Perovskite Thin Films

AutorLópez Mir, Laura CSIC ORCID; Balcells Argemi, Lluis; Valencia, Sergio; Kronast, Florian; Martínez Perea, Benjamín CSIC ORCID; Miguel, Juan José de; Ocal, Carmen CSIC ORCID
Fecha de publicación7-sep-2016
EditorAmerican Chemical Society
CitaciónCrystal Growth and Design 16(9): 5479–5486 (2016)
ResumenThe spontaneous formation of double chemical terminated surfaces of La0.7Sr0.3MnO3 due to deviations from ideal epitaxial growth during its deposition on SrTiO3(001) is presented. The development of surface regions with differentiated topmost composition leads to outstanding surface nanostructuration presenting notably distinct local properties, particularly in terms of electric transport and local work function. Correlation between combined atomic force microscopy and X-ray photoelectron spectroscopy data allows the chemical identification of the two terminations as corresponding to La0.7Sr0.3O and MnO2. The most likely atomistic process at the origin of the surface organization has been interpreted by Monte Carlo simulations that reveal the importance of stacking fault formation as growth proceeds. We present a physical understanding of the experimental results for surfaces in which different electronic responses coexist. The conclusions of the present work can be extended to the growth of other perovskite thin films, therefore broadening the field of functional materials nanostructuration.
Versión del editorhttp://dx.doi.org/10.1021/acs.cgd.6b00933
URIhttp://hdl.handle.net/10261/137223
DOI10.1021/acs.cgd.6b00933
ISSN1528-7483
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