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  • 68.55.Gi  (1)
  • 71.28  (1)
  • 74.25 Jb  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron and hole doping in NiO (1995)
    Springer
    The European physical journal 97 (1995), S. 83-93 
    Details
    ISSN: 1434-6036
    Keywords: 79.60 ; 71.20 ; 71.28
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated hole doped (by lithium) and electron-doped (by nickel metal) NiO with photoemission (PES), inverse photoemission (IPES) and low and high energy electron energy loss spectroscopy (EELS). Both types of doping create empty states approximately in the middle of the charge transfer gap of undoped NiO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317591
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and electronic structure of phase pure K3C60 (1995)
    Springer
    The European physical journal 98 (1995), S. 9-15 
    Details
    ISSN: 1434-6036
    Keywords: 68.55.Gi ; 71.20.Hk ; 71.45.Gm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Phase pure K3C60 films have been grown using vacuum distillation. The structure of such films could be shown to be face centered cubic consistent with X-ray diffraction studies. The electronic structure of the films has been studied using electron energy-loss spectroscopy in transmission. From C1s core excitation measurements the unoccupied density of states has been determined. Performing the dielectric function has been derived in a wide energy range (0–45 eV). It is shown that the low energy part of the optical conductivity cannot be understood within a simple free electron model but that interband transitions between the three conduction bands have to be taken into account. The spectral weight of interband transitions between valence and conduction bands shows strong momentum dependence due to optical selection rules demonstrating the molecular-like nature of the electronic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01318272
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  • 3
    Electronic Resource
    Electronic Resource
    Polarization-dependent angle-resolved photoemission of the layered cuprate Ba2Cu3O4Cl2 (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 341-346 
    Details
    ISSN: 1573-7357
    Keywords: 74.25 Jb ; 74.72 Jt ; 79.60 Bm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report polarization-dependent angle-resolved photoemission studies of single crystalline Ba2Cu3O4Cl2. This antiferromagnet adopts a layered body-centered tetragonal structure related to that of the cuprates, but with anextra copper site resulting in a plane with Cu3O4 stoichiometry. For the Γ-M direction of the Brillouin zone we observe a dispersive feature with a bandwidth of 400 ±80 meV, which approaches to within ∼ 0.9 eV of the Fermi level at (π/2,π/2). The magnitude of the observed dispersion and its polarization dependence are consistent with its origin as a purely antibonding combination of O2px,y and $$Cu3d_{x^2 - y^2 }$$ atomic orbitals from the cuprate-like CuO2 sub-system, i.e. Zhang-Rice singlets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768409
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