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  • 1995-1999  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Particle number projecting method for the description of pairing effects in metal clusters (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 645-654 
    Details
    ISSN: 0392-6737
    Schlagwort(e): BCS theory ; applications ; Atomic and molecular clusters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary The particle number projecting method for the description of pairing effects in metal clusters is proposed. In contrast with the Bardeen-Cooper-Schrieffer method (BCS) which does not conserve the particle number (thus not providing the necessary accuracy of calculations for small clusters) and has no solutions at sufficiently weak pairing, the projecting method can be applied to both small and large clusters with any pairing strength. As an example, the projection method is used to check the assertion on the pairing origin of the odd-even staggering (OES) in the ionization potentials (IP) of sodium clusters. Both effects of pairing and shape deformation are taken into account simultaneously. In general, the results obtained show that the existence of pairing in sodium clusters is doubtful.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02453255
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  • 2
    Digitale Medien
    Digitale Medien
    Pair Correlations and Magnetic Susceptibility of Small Al-Grains (1999)
    Springer
    Journal of cluster science 10 (1999), S. 195-220 
    Details
    ISSN: 1572-8862
    Schlagwort(e): Magnetic susceptibility ; pair correlations ; aluminum clusters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Pair correlations and the magnetic susceptibility of electrons in a spherical cavity are studied both for grand canonical and the canonical ensemble. The coupling constant of the BCS Hamiltonian is adjusted to experimental values of the gap parameter. The gap parameter is found to increase for small grains as a consequence of the pronounced shell structure in the spectrum of the spherical cavity. The sharp phase transition at Tc is smeared out for the canonical ensemble. The strong paramagnetic susceptibility of the normal electrons in the cavity is reduced by the superconductivity, but it remains positive.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022617104452
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  • 3
    Digitale Medien
    Digitale Medien
    Triaxial shapes of sodium clusters (1995)
    Springer
    The European physical journal 34 (1995), S. 125-134 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 36.40 ; 35.20.Wg ; 71.45.Nt
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A modified Nilsson-Clemenger model is combined with Strutinsky's shell correction method. For spherical clusters, the model potential is fitted to the single-particle spectra obtained from selfconsistent Kohn-Sham calculations. The deformation energy surfaces of sodium clusters with sizes of up toN=270 atoms are calculated for a combination of triaxial, quadrupole and hexadecapole deformations. The ground state shapes and energies are determined by simultaneous minimization with respect to the three shape parameters. A significant fraction of the clusters is predicted to be triaxial. The deviations from the axial shape do not generate any systematic odd-even staggering of the binding energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01439387
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