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

doi:10.1143/JPSJ.74.2538

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

SCI - Physics

Research output: Contribution to journal › Article

14 Citations (Scopus)

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
Pages (from-to)	2538-2543
Number of pages	6
Journal	journal of the physical society of japan
Volume	74
Issue number	9
DOIs	https://doi.org/10.1143/JPSJ.74.2538
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)

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Yamasaki, A., Sekiyama, A., Imada, S., Tsunekawa, M., Dallera, C., Braicovich, L., Lee, T. L., Ochiai, A., & Suga, S. (2005). Photoemission spectroscopy of Sm₄As₃ using soft and hard X-rays. journal of the physical society of japan, 74(9), 2538-2543. https://doi.org/10.1143/JPSJ.74.2538

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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.",

keywords = "Bulk sensitivity, Hard X-ray, Photoemission spectroscopy, Sm compounds, Soft X-ray",

author = "Atsushi Yamasaki and Akira Sekiyama and Shin Imada and Masanori Tsunekawa and Claudia Dallera and Lucio Braicovich and Lee, {Tien Lin} and Akira Ochiai and Shigemasa Suga",

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T1 - Photoemission spectroscopy of Sm4As3 using soft and hard X-rays

AU - Yamasaki, Atsushi

AU - Sekiyama, Akira

AU - Imada, Shin

AU - Tsunekawa, Masanori

AU - Dallera, Claudia

AU - Braicovich, Lucio

AU - Lee, Tien Lin

AU - Ochiai, Akira

AU - Suga, Shigemasa

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AB - 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.

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KW - Photoemission spectroscopy

KW - Sm compounds

KW - Soft X-ray

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