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

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

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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
Issue number13
Publication statusPublished - 2003 Oct
Externally publishedYes


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].