Abstract:
:In traditional models of heteroepitaxy, the substrate serves mainly as a crystalline template for the thin-film lattice, dictating the initial roughness of the film and the degree of coherent strain. Here, performing in situ surface x-ray diffraction during the heteroepitaxial growth of LaTiO3 on SrTiO3 (001), we find that a TiO2 adlayer composed of the ( 13 × 13 ) R33.7° and ( 2 × 2 ) R45.0° reconstructions is a highly active participant in the growth process, continually diffusing to the surface throughout deposition. The effects of the TiO2 adlayer on layer-by-layer growth are investigated using different deposition sequences and anomalous x-ray scattering, both of which permit detailed insight into the dynamic layer rearrangements that take place. Our work challenges commonly held assumptions regarding growth on TiO2-terminated SrTiO3 (001) and demonstrates the critical role of excess TiO2 surface stoichiometry on the initial stages of heteroepitaxial growth on this important perovskite oxide substrate material.
journal_name
Sci Advjournal_title
Science advancesauthors
Cook S,Letchworth-Weaver K,Tung IC,Andersen TK,Hong H,Marks LD,Fong DDdoi
10.1126/sciadv.aav0764subject
Has Abstractpub_date
2019-04-12 00:00:00pages
eaav0764issue
4issn
2375-2548pii
aav0764journal_volume
5pub_type
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