Scanning tunneling microscopy study of the misfit layer compounds (LaSe)xNbSe2 and (PbSe)xNbSe2

Sonia Antoranz Contera, Tatsuo Yoshinobu, Hiroshi Iwasaki, Kenji Kisoda

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3 Citations (Scopus)

Abstract

Atomic images of the misfit layer compounds (LaSe)xNbSe2 and (PbSe)xNbSe2 were obtained with a scanning tunneling microscope (STM) operating in constant height mode in air. It was possible to record pictures of only the NbSe2 layers of both compounds, the LaSe and PbSe layers could not be observed. Formation of stage-2 portions embedded in the stage-1 crystal and instability of the LaSe and PbSe layers under the scanning conditions are discussed as possible causes. Comparing with the NbSe2 crystal, the lattice of the NbSe2 layers of the misfit layer compounds appear deformed. Nonperiodic Moiré-like structures have been observed in the (LaSe)xNbSe2 surface. We consider that this feature is caused by the STM tip pushing down the surface where it is softer. The nonperiodicity of the patterns might be due to the strain conditions of the crystal growth that would give rise to dislocations and defects.

Original languageEnglish
Pages (from-to)6157-6160
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume37
Issue number11
DOIs
Publication statusPublished - 1998 Nov
Externally publishedYes

Keywords

  • Misfit layer compounds
  • Moiré pattern
  • Morphology
  • Roughness and topography
  • Scanning tunneling microscope
  • Surface structure
  • Transition metal dichalcogenides

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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