Electron Correlation Effects in Half-Metallic Transition Metal Oxides

Huang, D. J.; Tjeng, L. H.; Chen, J.; Chang, C. F.; Wu, W. P.; Rata, A. D.; Hibma, T.; Chung, S. C.; Shyu, S. G.; Wu, C. C.; Chen, C. T.

doi:10.1142/S0218625X02001872

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Electron Correlation Effects in Half-Metallic Transition Metal Oxides

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Huang, D. J., Tjeng, L. H., Chen, J., Chang, C. F., Wu, W. P., Rata, A. D., et al. (2002). Electron Correlation Effects in Half-Metallic Transition Metal Oxides. Surface Review and Letters, 9(2), 1007-1015. doi:10.1142/S0218625X02001872.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-1764-B

Abstract

Spin-resolved photoemission and absorption studies Of Fe3O4 and CrO2 epitaxial 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 that Fe3O4 should be considered as a strongly correlated system, and that Fe3O4 is not a half-metal. Spin-resolved O 1s X-ray absorption measurements on ferromagnetic CrO2 reveal 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 Cr 3d(2) ions.