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, and S. Suga
Phys. Rev. B 87, 235138 – Published 27 June 2013
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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.

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  • Received 28 September 2012

DOI:https://doi.org/10.1103/PhysRevB.87.235138

©2013 American Physical Society

Authors & Affiliations

M. Sperlich1,*, C. König1, G. Güntherodt1,†, A. Sekiyama2, G. Funabashi2, M. Tsunekawa2, S. Imada2, A. Shigemoto2, K. Okada3, A. Higashiya4, M. Yabashi4, K. Tamasaku4, T. Ishikawa4, V. Renken5, T. Allmers5, M. Donath5, and S. Suga2

  • 1II. Physikalisches Institut, RWTH Aachen University, 52074 Aachen, Germany
  • 2Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 3Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
  • 4SPring-8/Riken, 1-1-1 Kouto, Mikazuki, Sayo, Hyogo 679-8148, Japan
  • 5Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

  • *Present address: AREVA NP GmbH, Paul-Gossen-Straße 100, 91052 Erlangen, Germany.
  • Corresponding author: gernot.guentherodt@physik.rwth-aachen.de

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Issue

Vol. 87, Iss. 23 — 15 June 2013

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