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  • 02.60.Nm  (1)
  • 78.20.−e  (1)
  • ACAR  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Regularization in ellipsometry (1988)
    Springer
    Applied physics 45 (1988), S. 1-5 
    Details
    ISSN: 1432-0649
    Keywords: 02.60.Nm ; 07.60.Fs ; 78.20.−e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The continuous variation of the refractive index with the depth in the vicinity of surfaces can be determined by ellipsometry without destroying the object of measurements. The presented method does not impress any given structure to the profile and is applicable to just the range of layer thicknesses interesting to optics (about λ/4 to λ/2). The theoretical approach to interpret the measured data leads to an integral equation that is numerically inverted by regularization to filter out the destabilizing effects of measurement errors. The regularizing operator and regularization parameter responsible for this “filtering” are founded on physical arguments and experiment, respectively. These results can be transferred to other regularization problems based on quantities related to volume (e.g. density, temperature).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692332
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 169-173 
    Details
    ISSN: 1572-9605
    Keywords: La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-statistics (〉4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730389
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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