ELECTRON CORRELATION EFFECTS IN HALF-METALLIC TRANSITION METAL OXIDES

D. J. Huang, L. H. Tjeng, J. Chen, C. F. Chang, W. P. Wu, A. D. Rata, T. Hibma, S. C. Chung, S.-G. Shyu, C.-C. Wu and C. T. Chen
Additional contact information
D. J. Huang: Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, R.O.C.
L. H. Tjeng: Materials Science Center, University of Groningen, 9747 Ag Groningen, The Netherlands
J. Chen: Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, R.O.C.;
C. F. Chang: Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, R.O.C.
W. P. Wu: Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, R.O.C.;
A. D. Rata: Materials Science Center, University of Groningen, 9747 Ag Groningen, The Netherlands
T. Hibma: Materials Science Center, University of Groningen, 9747 Ag Groningen, The Netherlands
S. C. Chung: Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, R.O.C.
S.-G. Shyu: Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan, R.O.C.;
C.-C. Wu: Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan, R.O.C.
C. T. Chen: Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan, R.O.C.

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1007-1015

Abstract: Spin-resolved photoemission and absorption studies ofFe3O4andCrO2epitaxial thin films have been reviewed to address the relationship between the electron correlation effects and the half-metallic properties of these two materials. Spin-resolved photoemission results suggest thatFe3O4should be considered as a strongly correlated system, and thatFe3O4is not a half-metal. Spin-resolved O1sX-ray absorption measurements on ferromagneticCrO2reveal that the spin polarization of the unoccupied states closest to the Fermi level approaches 100%, confirming the half-metallic ferromagnetic nature of the material. The spin polarization of the main line of the unoccupied states, on the other hand, is found to be only 50%, indicating a very atomic-like behavior of the Cr3d2ions.

Date: 2002
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DOI: 10.1142/S0218625X02001872

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