Nanoscale structural variation observed on the vicinal SrTiO3 (001) surface

Susumu Shiraki, Masashi Nantoh, Satoshi Katano, Maki Kawai

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10 Citations (Scopus)

Abstract

The vicinal (001) surface of a Nb-doped SrTiO3 single crystal has been investigated by scanning tunneling microscopy and low energy electron diffraction. The stepped surface prepared by annealing in ultrahigh vacuum at 250 °C exhibits a complex atomic structure composed of four types of reconstructions, which shows short-range variation within nanoscale regions. SrO layers show a c (6×2) structure being stable up to 1000 °C, while √13×√13-R33.7°, c (√13×√13) -R33.7°, and c (√2×√18) -R45° structures are formed on TiO 2 layers, which disappear at 450-750 °C followed by the formation of 2×2 and √5×√5-R26.6° structures. These results indicate instability of the reconstructions on the TiO2 terminated surface due to the variation in Sr adatom density caused by multikinetic processes, in contrast to the thermodynamically stable SrO terminated surface.

Original languageEnglish
Article number231901
JournalApplied Physics Letters
Volume96
Issue number23
DOIs
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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