Surface Structure and Electronic Property of Reduced SrTiO3(100) Surface Observed by Scanning Tunneling Microscopy/Spectroscopy

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Copyright (c) 1993 The Japan Society of Applied Physics
, , Citation Hiroyuki Tanaka et al 1993 Jpn. J. Appl. Phys. 32 1405 DOI 10.1143/JJAP.32.1405

1347-4065/32/3S/1405

Abstract

We have obtained the scanning tunneling microscopy (STM) images and scanning tunneling spectroscopy (STS) data with atomic-scale resolution for a SrTiO3(100) surface annealed in ultrahigh vacuum (UHV) at 1200°C. A √5×√5-R26.6° surface superstructure indicating oxygen vacancy ordering has been observed. The STS data provide evidence for a localized surface state arising from oxygen vacancies at 1.35 eV below the Fermi level. STM images of the √5×√5 structure correspond to the surface orbital of the ordered Ti-oxygen vacancy complex.

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