Abstract
Bulk-sensitive hard x-ray photoemission spectroscopy (HAXPES) reveals for as-grown epitaxial films of half-metallic ferromagnetic CrO(100) a pronounced screening feature in the Cr 2 core level and an asymmetry in the O 1 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 ≅ 3.2 eV.
- Received 28 September 2012
DOI:https://doi.org/10.1103/PhysRevB.87.235138
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