X-Ray Photoemission Spectroscopic Study on the Electronic States in the Mixed System between Charge-Transfer and Mott-Hubbard Type Metals: Co0.91S and V0.91S

Teruki Motohashi, Keiso Hayashi, Masanori Matoba, Shuichiro Anzai, Atsushi Fujimori

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Abstract

In order to study the change of the electronic states from the charge-transfer(CT) type metal to the Mott-Hubbard(MH) one, X-ray photoemission spectra are measured on the NiAs-type (Co1-xVx)0.91S (x ≤ 0.50) and V0.91S. The asymmetry parameter α for S 2s and 2p core level spectra decrease with increasing x. This result indicates that the local density of states of S atoms at the Fermi level decreases as x increases; the system changes from the CT-type metal to the MH-one with x. The change in V 2p line shape with x suggests the possibility of the considerable hybridization between V 3d and S 3p in (Co1-xVx)0.91S at lower x region. This feature would be related to the appearance of the extra peak at binding energy EB = 2-3 eV in the valence band X-ray photoemission spectra.

Original languageEnglish
Pages (from-to)1312-1316
Number of pages5
JournalJournal of the Physical Society of Japan
Volume65
Issue number5
Publication statusPublished - 1996

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Keywords

  • (CoV)S
  • Asymmetry parameter α
  • Charge-transfer type metal
  • Local density of states
  • Mott-hubbard type metal
  • XPS

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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