Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi

J. Y. Son, K. Okazaki, Takashi Mizokawa, A. Fujimori, T. Kanomata, R. Note

Research output: Contribution to journalArticle

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Abstract

FexCo1-xSi is a metal with helical spin structure in the concentration range 0.2<x<0.95 although the end members are a narrow-gap semiconductor (FeSi) and a diamagnetic semimetal (CoSi). We have studied the electronic structure of FexCo1-xSi (x = 0.5, 0.8) using ultraviolet photoemission spectroscopy. With Fe substitution for Co, the structure due to the transition-metal 3d states is shifted toward lower binding energies, qualitatively consistent with the prediction of the rigid-band model. Although the superposition of the spectra of FeSi and CoSi better describes the x dependence of the global spectral features than the rigid-band model, the x dependence near the Fermi level (EF) is better described by the rigid-band model. The appearance of magnetic order in FexCo1-xSi may thus be explained by the rigid-band model, which predicts that the density of states at EF is low or zero for CoSi and FeSi but becomes large for intermediate x. We also find a weak temperature dependence around the Fermi level, qualitatively consistent with the increase in the electrical resistivity below the Néel temperature (TN).

Original languageEnglish
Article number134447
Pages (from-to)1344471-1344474
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number13
Publication statusPublished - 2003 Oct
Externally publishedYes

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Photoemission
photoelectric emission
Electrons
Fermi level
electrons
Metalloids
metalloids
Photoelectron spectroscopy
Ultraviolet spectroscopy
Binding energy
Electronic structure
Transition metals
Substitution reactions
binding energy
Metals
transition metals
substitutes
Semiconductor materials
electronic structure
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Son, J. Y., Okazaki, K., Mizokawa, T., Fujimori, A., Kanomata, T., & Note, R. (2003). Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi. Physical Review B - Condensed Matter and Materials Physics, 68(13), 1344471-1344474. [134447].

Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi. / Son, J. Y.; Okazaki, K.; Mizokawa, Takashi; Fujimori, A.; Kanomata, T.; Note, R.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 68, No. 13, 134447, 10.2003, p. 1344471-1344474.

Research output: Contribution to journalArticle

Son, JY, Okazaki, K, Mizokawa, T, Fujimori, A, Kanomata, T & Note, R 2003, 'Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi', Physical Review B - Condensed Matter and Materials Physics, vol. 68, no. 13, 134447, pp. 1344471-1344474.
Son JY, Okazaki K, Mizokawa T, Fujimori A, Kanomata T, Note R. Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi. Physical Review B - Condensed Matter and Materials Physics. 2003 Oct;68(13):1344471-1344474. 134447.
Son, J. Y. ; Okazaki, K. ; Mizokawa, Takashi ; Fujimori, A. ; Kanomata, T. ; Note, R. / Photoemission study of the itinerant-electron helimagnet Fe xCo1-xSi. In: Physical Review B - Condensed Matter and Materials Physics. 2003 ; Vol. 68, No. 13. pp. 1344471-1344474.
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