Intrinsic Correlated Electronic Structure of CrO2 Revealed by Hard X-ray Photoemission Spectroscopy

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 away from 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 unravelled, yielding an averaged Coulomb correlation energy Uav ~ 3.2 eV.

Manuscript 12 pages, 4 figures; Supplemental material 7 pages, 5 figures

References in corpus (4)

• Half-metallic ferromagnets: From band structure to many-body effects
• Bulk screening in core level photoemission from Mott-Hubbard and Charge-Transfer systems
• Evidence for strong electronic correlations in the spectra of Sr${}_2$RuO${}_4$
• Recoil Effect of Photoelectrons in the Fermi-Edge of Simple Metals

Cited by in corpus (5)

• Weakly-correlated nature of ferromagnetism in non symmorphic CrO${}_2$ revealed by bulk-sensitive soft X ray ARPES
• Intrinsic spin polarized electronic structure of CrO2 epitaxial film revealed by bulk-sensitive spin-resolved photoemission spectroscopy
• Origins of thermal spin depolarization in half-metallic ferromagnet CrO${}_2$
• Atomic multiplet and charge-transfer screening effects in 1$s$ and 2$p$ core-level X-ray photoelectron spectra of early 3$d$ transition-metal oxides
• Observation of Intrinsic Half-metallic Behavior of CrO${}_2$ (100) Epitaxial Films by Bulk-sensitive Spin-resolved PES