Phys. Rev. B 69, 085107 (2004) [8 pages]Magnetic circular dichroism in Fe 2p resonant photoemission of magnetiteReceived 5 December 2002; revised 31 March 2003; published 24 February 2004 Measurements of magnetic circular dichroism in Fe 2p resonant photoemission and calculations based on a full-multiplet cluster model reveal the parameters of the electronic structure of Fe3O4. We obtained on-site Coulomb energy Udd of 3d electrons, charge-transfer energy Δ which is defined as the energy required to transfer an electron from O 2p to Fe 3d, and the hybridization strength between Fe 3d and O 2p at different Fe ion sites of Fe3O4 by analyzing the data of magnetic circular dichroism. The charge-transfer energy of Fe3+ ions was found to be significantly smaller than that of Fe2+ ions. We determined the energy positions of the low-lying multiplets of each Fe ion site. These energy positions for Fe3+ ion sites are 1.5–2.5 eV higher than those obtained from band-structure calculations. Our calculations also show that the photoemission spectral weight in binding energy bigger than 10 eV is substantial, in contrast to the results of band-structure calculations. Our findings conclude that Fe3O4 is a system with strong electron-electron interactions. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.085107
DOI:
10.1103/PhysRevB.69.085107
PACS:
71.28.+d, 75.50.Ss, 75.25.+z, 78.70.Dm
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