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Orbital character of O 2p unoccupied states near the Fermi level in CrO2 | C. B. Stagarescu
; X. Su
; D. E. Eastman K. N. Altmann
; F. J. Himpsel A. Gupta
; | Date: |
22 Oct 1999 | Subject: | Materials Science; Strongly Correlated Electrons | cond-mat.mtrl-sci cond-mat.str-el | Affiliation: | James Franck Institute, The University of Chicago) K. N. Altmann and F. J. Himpsel (Department of Physics, University of Wisconsin Madison) A. Gupta (IBM T. J. Watson Research Center | Abstract: | 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 using polarization-dependent X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) from high-quality, single-crystal films. A sharp peak observed just above $E_F$ is excited only by the electric field vector ($f E$) 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 comparison with band-structure and configuration-interaction (CI) cluster calculations our results support a model of CrO$_2$ as a half-metallic ferromagnet with large exchange-splitting energy ($Delta_{exch-split}$ $approx$ 3.0 eV) and substantial correlation effects. | Source: | arXiv, cond-mat/9910346 | Services: | Forum | Review | PDF | Favorites |
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