Abstract
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 language | English |
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Pages (from-to) | 2538-2543 |
Number of pages | 6 |
Journal | journal of the physical society of japan |
Volume | 74 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2005 Sep 1 |
Keywords
- Bulk sensitivity
- Hard X-ray
- Photoemission spectroscopy
- Sm compounds
- Soft X-ray
ASJC Scopus subject areas
- Physics and Astronomy(all)