Surface alloy formation at the Sm Ru(001) interface: evidence from Ru 3d core-level emission

G. Ranga Rao, Y. Kadowaki, H. Kondoh, H. Nozoye

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Vapor deposited Sm on a Ru(001) surface at 500 K has been investigated by X-ray photoelectron spectroscopy (XPS), temperature programmed desorption spectroscopy (TPD) and work function measurements. The development of a first monolayer can be described as simple adsorption of Sm on the Ru(001) surface. At higher coverages, intermixing of Sm and Ru occurs leading to the formation of a SmRu alloy. The formation of an interfacial alloy above 1 ML coverage is confirmed by Ru 3d core-level photoemission. The average valency of Sm in the alloy phase is determined. Temperature dependent experiments indicate the formation of two alloy phases at the 400-700 and 700-800 K regions. TPD data indicate the zero-order desorption of Sm. Work function changes show that there is a significant amount of charge transfer from Sm atoms to the Ru substrate at low coverages.

Original languageEnglish
Pages (from-to)293-300
Number of pages8
JournalSurface Science
Volume327
Issue number3
DOIs
Publication statusPublished - 1995 Apr 10
Externally publishedYes

Keywords

  • Auger electron spectroscopy
  • Compound formation
  • Growth
  • Interface states
  • Low index single crystal surfaces
  • Metallic films
  • Ruthenium
  • Single crystal epitaxy
  • Thermal desorption
  • Thermal desorption spectroscopy
  • Visible and ultraviolet photoelectron spectroscopy
  • Work function measurements
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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