Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity

Hirofumi Oka, Yoshinori Okada, Taro Hitosugi, Tomoteru Fukumura

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1 Citation (Scopus)

Abstract

Pulsed laser deposition-grown SrVO3 (001) ultrathin films on SrTiO3 (001) substrates were investigated by in situ low-temperature scanning tunneling microscopy and spectroscopy. SrVO3 (001) ultrathin films showed two distinct surface terminations. One termination was a (2 ×2)-R45° reconstruction as was previously observed for SrVO3 (001) thick films, while the other was a (5 ×5)-R26.6° reconstruction. Scanning tunneling spectroscopy revealed that the (2 ×2)-R45° surface shows a metallic electronic structure, whereas the (5×5)-R26.6° surface exhibits a significantly reduced density of states at the Fermi level. These results suggest that the surface reconstruction may be an important factor to influence metallicity in epitaxial ultrathin films of transition metal oxides.

Original languageEnglish
Article number171601
JournalApplied Physics Letters
Volume113
Issue number17
DOIs
Publication statusPublished - 2018 Oct 22

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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