Intrinsic correlated electronic structure of CrO2 revealed by hard x-ray photoemission spectroscopy

M. Sperlich, C. König, G. Güntherodt, A. Sekiyama, G. Funabashi, M. Tsunekawa, S. Imada, A. Shigemoto, K. Okada, A. Higashiya, M. Yabashi, K. Tamasaku, T. Ishikawa, V. Renken, T. Allmers, M. Donath, S. Suga

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13 Citations (Scopus)

Abstract

Bulk-sensitive hard x-ray photoemission spectroscopy (HAXPES) reveals for as-grown epitaxial films of half-metallic ferromagnetic CrO2(100) a pronounced screening feature in the Cr 2p3/2 core level and an asymmetry in the O 1s core level. This gives evidence of a finite, metal-type Fermi edge, which is surprisingly not observed in HAXPES. A spectral weight shift in HAXPES to below the Fermi energy is attributed to single-ion recoil effects due to high-energy photoelectrons. In conjunction with inverse PES the intrinsic correlated Mott-Hubbard-type electronic structure is unraveled, yielding an averaged Coulomb correlation energy Uav ≅ 3.2 eV.

Original languageEnglish
Article number235138
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number23
DOIs
Publication statusPublished - Jun 27 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Sperlich, M., König, C., Güntherodt, G., Sekiyama, A., Funabashi, G., Tsunekawa, M., Imada, S., Shigemoto, A., Okada, K., Higashiya, A., Yabashi, M., Tamasaku, K., Ishikawa, T., Renken, V., Allmers, T., Donath, M., & Suga, S. (2013). Intrinsic correlated electronic structure of CrO2 revealed by hard x-ray photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 87(23), [235138]. https://doi.org/10.1103/PhysRevB.87.235138