Photoemission spectroscopy of Sm4As3 using soft and hard X-rays

Atsushi Yamasaki, Akira Sekiyama, Shin Imada, Masanori Tsunekawa, Claudia Dallera, Lucio Braicovich, Tien Lin Lee, Akira Ochiai, Shigemasa Suga

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The bulk and surface electronic structures of Sm4As3 have been investigated by hard and soft X-ray photoemission spectroscopies (PESs). PES with a wide range of photon energies (hv's) between 220 and 2450 eV demonstrates the absence of valence mixing in both high- and low-temperature phases, that is, the valence of Sm ions is definitely trivalent in the bulk and divalent on the surface. Atomic multiplet calculations taking into account the bulk and surface spectral weights at each hv well reproduce the experimental valence band PES and Sm 3d core-level spectra, supporting the valence difference between bulk and surface in Sm4As3.

Original languageEnglish
Pages (from-to)2538-2543
Number of pages6
Journaljournal of the physical society of japan
Issue number9
Publication statusPublished - 2005 Sep 1


  • Bulk sensitivity
  • Hard X-ray
  • Photoemission spectroscopy
  • Sm compounds
  • Soft X-ray

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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