Orbital character of O-2p unoccupied states near the Fermi level in CrO{sub 2}
- James Franck Institute, The University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637 (United States)
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706-1390 (United States)
- IBM T. J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
The orbital character, orientation, and magnetic polarization of the O-2p unoccupied states near the Fermi level (E{sub F}) in CrO{sub 2} was determined using polarization-dependent x-ray absorption spectroscopy and x-ray magnetic circular dichroism from high-quality, single-crystal films. A sharp peak observed just above E{sub F} is excited only by the electric-field vector (E) normal to the tetragonal c axis, characteristic of a narrow band ({approx_equal}0.7 eV bandwidth) constituted from O-2p orbitals perpendicular to c (O-2p{sub y}) hybridized with Cr 3d{sub xz-yz} t{sub 2g} states. By comparison with band-structure and configuration-interaction cluster calculations our results support a model of CrO{sub 2} as a half-metallic ferromagnet with large exchange-splitting energy ({delta}{sub exch-split}{approx_equal}3.0 eV) and substantial correlation effects. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215844
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 61; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
BAND THEORY
CHROMIUM OXIDES
ELECTRON EXCHANGE
ELECTRONIC STRUCTURE
ENERGY-LEVEL DENSITY
EXCHANGE INTERACTIONS
EXPERIMENTAL DATA
FERMI LEVEL
FERROMAGNETIC MATERIALS
MAGNETIC CIRCULAR DICHROISM
MAGNETIC PROPERTIES
POLARIZABILITY
THEORETICAL DATA
THIN FILMS
X-RAY SPECTRA