Co substitution effect on the electronic structure of NiS studied by x-ray photoemission spectroscopy

Takeshi Mamori, Masanori Matoba, Atsushi Fujimori, Shuichiro Anzai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

X-ray photoemission spectroscopy (XPS) measurements of the valence band, Ni 2p core level, Co 2p core level and S 2s, 2p core levels were carried out on the metallic state of Ni1-v CovS (0≤v;≤0.06). The main peak of the valence band spectra shifts toward lower binding energy (EB) with increasing v (dEBdv = -2.6±0.4 eV/mol). This behavior is different from those reported on vacancy introduction or on the Se substitution in Ni1-xS or NiS1-ySey (dEBB/ dx≈0; dEB/dy≈0). The Ni 2p3/2 core level peak also shifts toward lower EB (dEB/dv= -1.8±0.6 eV/mol), while no change in the S 2s or 2p core level peak is observed. We propose the possibility that the hybridization between the Co d7L and the Ni d8L peaks near the EF, where L denotes a ligand hole, leads to the modification of the electronic state of Ni sites in 1-vCovS.

Original languageEnglish
Pages (from-to)433-436
Number of pages4
JournalJournal of the Physical Society of Japan
Volume61
Issue number2
Publication statusPublished - 1992 Feb

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photoelectric emission
substitutes
electronic structure
spectroscopy
x rays
valence
shift
binding energy
ligands
electronics

Keywords

  • Charge transfer
  • NiCo S
  • Nonmetal-metal transition
  • XPS

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Co substitution effect on the electronic structure of NiS studied by x-ray photoemission spectroscopy. / Mamori, Takeshi; Matoba, Masanori; Fujimori, Atsushi; Anzai, Shuichiro.

In: Journal of the Physical Society of Japan, Vol. 61, No. 2, 02.1992, p. 433-436.

Research output: Contribution to journalArticle

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AU - Matoba, Masanori

AU - Fujimori, Atsushi

AU - Anzai, Shuichiro

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N2 - X-ray photoemission spectroscopy (XPS) measurements of the valence band, Ni 2p core level, Co 2p core level and S 2s, 2p core levels were carried out on the metallic state of Ni1-v CovS (0≤v;≤0.06). The main peak of the valence band spectra shifts toward lower binding energy (EB) with increasing v (dEBdv = -2.6±0.4 eV/mol). This behavior is different from those reported on vacancy introduction or on the Se substitution in Ni1-xS or NiS1-ySey (dEBB/ dx≈0; dEB/dy≈0). The Ni 2p3/2 core level peak also shifts toward lower EB (dEB/dv= -1.8±0.6 eV/mol), while no change in the S 2s or 2p core level peak is observed. We propose the possibility that the hybridization between the Co d7L and the Ni d8L peaks near the EF, where L denotes a ligand hole, leads to the modification of the electronic state of Ni sites in 1-vCovS.

AB - X-ray photoemission spectroscopy (XPS) measurements of the valence band, Ni 2p core level, Co 2p core level and S 2s, 2p core levels were carried out on the metallic state of Ni1-v CovS (0≤v;≤0.06). The main peak of the valence band spectra shifts toward lower binding energy (EB) with increasing v (dEBdv = -2.6±0.4 eV/mol). This behavior is different from those reported on vacancy introduction or on the Se substitution in Ni1-xS or NiS1-ySey (dEBB/ dx≈0; dEB/dy≈0). The Ni 2p3/2 core level peak also shifts toward lower EB (dEB/dv= -1.8±0.6 eV/mol), while no change in the S 2s or 2p core level peak is observed. We propose the possibility that the hybridization between the Co d7L and the Ni d8L peaks near the EF, where L denotes a ligand hole, leads to the modification of the electronic state of Ni sites in 1-vCovS.

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