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The orbital character, orientation, and magnetic polarization of the O 2$p$unoccupied states near the Fermi level ($E_F$) in CrO$_2$ was determined usingpolarization-dependent X-ray absorption spectroscopy (XAS) and X-ray magneticcircular dichroism (XMCD) from high-quality, single-crystal films. A sharp peakobserved just above $E_F$ is excited only by the electric field vector ($\bfE$) normal to the tetragonal $c$-axis, characteristic of a narrow band($\approx$ 0.7 eV bandwidth) constituted from O 2$p$ orbitals perpendicular to$c$ (O 2$p_y$) hybridized with Cr 3$d_{xz-yz}$ $t_{2g}$ states. By comparisonwith band-structure and configuration-interaction (CI) cluster calculations ourresults support a model of CrO$_2$ as a half-metallic ferromagnet with largeexchange-splitting energy ($\Delta_{exch-split}$ $\approx$ 3.0 eV) andsubstantial correlation effects.Comment: 4 pages, 3 figures, accepted for publication in Phys. Rev. B Rapid  Com

physical review. b, condensed matter

Orbital character of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">O</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn><mml:mi>p</mml:mi></mml:math>unoccupied states near the Fermi level in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CrO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Orbital character ofO−2punoccupied states near the Fermi level inCrO2