Thickness-dependent local surface electronic structures of homoepitaxial SrTiO3 thin films

T. Ohsawa, K. Iwaya, R. Shimizu, T. Hashizume, T. Hitosugi

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    25 Citations (Scopus)

    Abstract

    We have investigated the atomically-resolved substrate and homoepitaxial thin film surfaces of SrTiO3 (001) using low-temperature scanning tunneling microscopy/scanning tunneling spectroscopy (STS) combined with pulsed laser deposition. It was found that a typical annealing treatment for preparation of SrTiO3 substrates, unexpectedly, resulted in a disordered surface on an atomic scale. In contrast, homoepitaxial SrTiO 3 thin films grown on this disordered substrate exhibited a (2×2) surface reconstruction. The STS measurements revealed a number of surface defects in a 10 unit cell thick SrTiO3 film but much fewer in a 50 unit cell thick film, indicating nonuniform stoichiometry along the growth direction. These results suggest the possibility of using homoepitaxial SrTiO3 film surfaces as idealized substrates, opening a way to extract novel functionalities in complex oxides heterostructures.

    Original languageEnglish
    Article number073710
    JournalJournal of Applied Physics
    Volume108
    Issue number7
    DOIs
    Publication statusPublished - 2010 Oct 1

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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