Electronic states of magnetite from photoemission spectroscopy ARUPS

Abstract The valence band photoemission spectra of epitaxially grown film and bulk single crystal of magnetite were measured by the angle‐resolved ultraviolet photoemission spectroscopy (ARUPS) at 300 K and 120 K. Four main features of the electron photoemission were observed at about –1.0 eV, –3.5 eV, –5.0 eV and –6.5 eV below the chemical potential; they are rather strongly dependant on structure and preparation of surface. The three higher‐energy features showed significant energy dispersion. The ARUPS spectra were compared to the accessible band structure calculations. Special attention was paid to the leading edge of the emission at –1.0 eV of the low‐temperature spectrum where an insulating gap should be observed. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)