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  • Springer  (30)
  • 2000-2004  (8)
  • 1995-1999  (22)
  • 1
    Electronic Resource
    Electronic Resource
    The metallofullerene Tm@C82: isomer-selective electronic structure (1998)
    Springer
    Applied physics 66 (1998), S. 281-285 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 71.20Tx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 82 using photoemission and electron energy-loss spectroscopy in transmission. In particular, the impact of the isomer symmetry of the C82 cage (Cs or C3v) on the electronic structure and on the optical properties is analysed in detail. For both isomers, combined XPS and XAS measurements of the Tm 4f and 4d states offer conclusive proof of a divalent encaged Tm ion. No significant change of the valence of the rare earth ion upon changes in the cage symmetry is observed. From the C 1s excitation spectra we find a more pronounced LUMO for the C3v(8) isomer, as is expected for the higher symmetry of the cage. Additional information about the optical properties was obtained from the low-energy loss function. With use of a Kramers–Kronig analysis, the dielectric function, ε, and the optical conductivity, σ, have been derived. ε(0) and the onset of the spectral weight are found to be 7.7 [12.8] and 0.6 eV [0.8 eV] for the Cs(6) {C3v(8)} isomer, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050667
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Influence of the core polarization on the dielectric properties of polyvalent metals (1998)
    Springer
    The European physical journal 6 (1998), S. 323-328 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Gm Exchange, correlation, dielectric and magnetic functions, plasmons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We have measured the dispersion of plasmon excitations in polycrystalline Sn, Pb, Cd and Zn using electron energy-loss spectroscopy (EELS) in transmission. These metals show a remarkable deviation of their plasmon behaviour from standard theoretical expectations which can be attributed to the presence of shallow core levels in the energetic neighborhood of the plasmon energy. The position of the plasmon resonance in the long wavelength limit is in line with predictions from model assumptions taking into account the core level polarization effects. We show that not only the plasmon energy in the optical limit but also the plasmon dispersion is altered by the interaction of the charge carrier plasmon and the core level excitations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050556
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    The electronic structure of from high energy spectroscopy (1998)
    Springer
    The European physical journal 1 (1998), S. 11-17 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.20.Tx Fullerenes and related materials; intercalation compounds - 79.60.Fr Polymers; organic compounds - 78.90.+t Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report the results of a detailed study of the occupied and unoccupied electronic structure of dimers of the new heterofullerene by means of photoemission and electron energy-loss spectroscopy. A close similarity is found between the electronic structures of pristine and with an additional broadening of the spectra in the former due to the distortion of the fullerene cage caused both by dimerization and the chemical substitution. Both the occupied and unoccupied electronic states, as well as the interband transitions between them, attest to the high degree of molecular character retained in the solid state. Comparison of the shake-up structures in the and X-ray photoemission spectra confirm that the highest lying occupied states in the heterofullerene have a strong degree of N character, whereas the lowest lying unoccupied states have mainly C character. We also present the optical conductivity of the heterofullerene (derived from the loss function), which shows an optical gap of 1.4 eV, some 0.4 eV smaller than that of .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050147
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of the first electron-removal states of using polarization dependent angle-resolved photoelectron spectroscopy (2000)
    Springer
    The European physical journal 14 (2000), S. 251-261 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.72.Jt Other cuprates - 79.60.-i Photoemission and photoelectron spectra - 71.27.+a Strongly correlated electron systems; heavy fermions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The first electron-removal states of the layered cuprate Ba2Cu3O4Cl2 were measured using angle-resolved photoelectron spectroscopy. The symmetry and energy-momentum relations of the lowest-lying states were determined and interpreted in terms of the motion of a single hole in the two different planar Cu-O subsystems of the Cu3O4 plane. One subsystem is antiferromagnetic as in the undoped parent compounds of the high-temperature superconductors and the other is paramagnetic and corresponds to the strongly overdoped case. The data are compared to theoretical results on hole dynamics in two-dimensional antiferromagnetic or paramagnetic spin backgrounds. The lineshape, symmetry and dispersion of the first electron-removal states of Ba2Cu3O4Cl2 can be described in terms of Zhang-Rice singlets within a single band model. The photohole lifetime in the paramagnetic subsystem of the Cu3O4 plane is much smaller than with an antiferromagnetic spin background.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050127
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  • 7
    Electronic Resource
    Electronic Resource
    The electronic structure of the doped one-dimensional transition metal oxide Y 2 - x Ca x BaNiO 5 studied using X-ray absorption (2002)
    Springer
    The European physical journal 26 (2002), S. 449-453 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 78.70.Dm X-ray absorption spectra – 71.28.+d Narrow-band systems; intermediate-valence solids – 79.60.-i Photoemission and photoelectron spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A strong anisotropic distribution of the holes in Ni 3 d and O 2 p orbitals is observed in the polarization dependent O 1 s and Ni 2 p 3/2 X-ray absorption spectroscopy of the linear-chain nickelate Y2-xCaxBaNiO5 (x = 0, 0.05, 0.1, 0.2), which demonstrates the one-dimensional nature of the electronic state in these compounds. The holes introduced by Ca-doping occupy both O 2 p and Ni 3 d orbitals along the NiO5 chains. By comparing the experimental Ni 2 p 3/2 absorption spectra of Y2-xCaxBaNiO5 to those from charge transfer multiplet calculations we can derive the orbital character of the additional holes to be of ∼60% O2 p and ∼40% Ni 3 d.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020113
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  • 8
    Electronic Resource
    Electronic Resource
    The electronic structure of polymerized fullerenes and dimerized heterofullerenes (1997)
    Springer
    Applied physics 64 (1997), S. 301-305 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.46+w; 71.20.Tx; 71.20.-b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: \chem{Rb_1C_{60}} and dimerised \chem{C_{59}N} using electron energy-loss spectroscopy in transmission. From the C1s excitation spectra a reduced density of \pi^\star states is observed for polymerized \chem{Rb_1C_{60}} . This is in contrast to \chem{(\chem{C_{59}N})_2} and can be explained by the different type of \squt{doping} and by the different bonding between the fullerene molecules in the two systems. Additional information about the optical properties was obtained from the low energy loss function. Using a Kramers-Kronig analysis, the dielectric function, ( \epsilon ), and the optical conductivity, ( \sigma ), have been derived. \epsilon(0) and the onset of the spectral weight have been compared between the polymer, the dimer and \chem{C_{60}} . This onset of spectral weight is found to be at \valunit*{1.2}{\eV} and \valunit{1.4}{\eV} for o- \chem{Rb_1C_{60}} and for \chem{(\chem{C_{59}N})_2} , respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050482
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  • 9
    Electronic Resource
    Electronic Resource
    X-Ray photoemission and electron-energy loss spectroscopic studies of Sr2CuO2Cl2 (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 335-340 
    Details
    ISSN: 1573-7357
    Keywords: 71.27. + a ; 74.72.Jt ; 79.60. −i ; 79.20.Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Sr2CuO2Cl2. represents a nearly ideal case of a 2-D antiferromagnetic CuO2-plane and thus is of particular interest in the context of the origins of high TC superconductivity. We present high energy spectroscopic results on single crystalline Sr2CuO2Cl2. Using electron-energy loss spectroscopy in transmission we have measured the loss function along the high symmetry directions in the CuO2-plane. X-ray photoemission spectroscopy is applied to study the valence band and the Cu 2p spectrum. Comparison of the experiment to a cluster calculation is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768408
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  • 10
    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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