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Electron Correlation Effects In Half-Metallic Transition Metal Oxides

Author

Listed:
  • 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.;
    Department of Physics, National Chung Cheng University, Chia-Yi 621, 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.;
    Department of Physics, National Chang Hua University of Education, Chang-Hua 500, 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.;
    Department of Chemistry, National Central University, Tao-Yuan 320, 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.)

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.

Suggested Citation

  • 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 & C. T. Chen, 2002. "Electron Correlation Effects In Half-Metallic Transition Metal Oxides," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(02), pages 1007-1015.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:02:n:s0218625x02001872
    DOI: 10.1142/S0218625X02001872
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