The observation of a surface resonance state in the valence-band structure of the perovskite
Carlo Waldfried; D N McIlroy; S-H Liou; R Sabiryanov; S S Jaswal; P A Dowben; Carlo Waldfried; Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska - Lincoln, Lincoln, NE 68588-0111, USA; D N McIlroy; Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska - Lincoln, Lincoln, NE 68588-0111, USA; S-H Liou; Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska - Lincoln, Lincoln, NE 68588-0111, USA; R Sabiryanov; Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska - Lincoln, Lincoln, NE 68588-0111, USA; S S Jaswal; Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska - Lincoln, Lincoln, NE 68588-0111, USA; P A Dowben; Department of Physics and Astronomy and the Center for Materials Research and Analysis, University of Nebraska - Lincoln, Lincoln, NE 68588-0111, USA
Журнал:
Journal of Physics: Condensed Matter
Дата:
1997-02-03
Аннотация:
The valence-band electronic structure of a crystalline thin film of has been investigated using angle-resolved photoemission. The observed valence-band structure has a substantial surface contribution and is strongly influenced by the surface conditions. Surface contamination and disorder attenuate the emission from a Mn-3d-derived state at a binding energy of 3.3 eV. This state was found to be localized at the surface with dispersion only in the plane of the surface and exhibited a strong intensity dependence on emission angle. On the basis of a simple LMTO-ASA bulk band calculation, it is clear that this state does not fall within a bulk band gap. We have therefore identified this Mn-3d-derived state at 3.3 eV below as a surface resonance.
173.8Кб