How heteroepitaxy occurs on strontium titanate

Seyoung Cook, Kendra Letchworth-Weaver, I. Cheng Tung, Tassie K. Andersen, Hawoong Hong, Laurence D. Marks, Dillon D. Fong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

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 LaTiO 3 on SrTiO 3 (001), we find that a TiO 2 adlayer composed of the (√ 13 × √ 13) R33.7° and (radic 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 TiO 2 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 TiO 2 -terminated SrTiO 3 (001) and demonstrates the critical role of excess TiO 2 surface stoichiometry on the initial stages of heteroepitaxial growth on this important perovskite oxide substrate material.

Original languageEnglish (US)
Article numbereaav0764
JournalScience Advances
Volume5
Issue number4
DOIs
StatePublished - 2019

ASJC Scopus subject areas

  • General

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