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  • Digitale Medien  (5)
  • 2000-2004  (5)
  • 2002  (2)
  • 2001  (3)
  • PACS. 75.10.Nr Spin-glass and other random models  (3)
  • PACS. 45.70.Cc Static sandpiles; granular compaction – 72.80.Tm Composite materials  (2)
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  • Digitale Medien  (5)
Erscheinungszeitraum
  • 2000-2004  (5)
Jahr
  • 2002  (2)
  • 2001  (3)
  • 2003  (1)
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Ultrametricity between states at different temperatures in spin-glasses (2002)
    Springer
    The European physical journal 29 (2002), S. 425-435 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 75.10.Nr Spin-glass and other random models
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We prove the existence of correlations between the equilibrium states at different temperatures of the multi-p-spin spherical spin-glass models with continuous replica symmetry breaking: there is no chaos in temperature in these models. Furthermore, the overlaps satisfy ultrametric relations. As a consequence the Parisi tree is essentially the same at all temperatures with lower branches developing when lowering the temperature. We conjecture that the reference free energies of the clusters are also fixed at all temperatures as in the generalized random-energy model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2002-00274-x
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  • 2
    Digitale Medien
    Digitale Medien
    Correlation between compacity distributions in compressed Si powders and in Si sintered pellets (2002)
    Springer
    The European physical journal 26 (2002), S. 35-39 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 45.70.Cc Static sandpiles; granular compaction – 72.80.Tm Composite materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Resistivity measurements have been performed on silicon powder beds with different thicknesses which were submitted to uniaxial pressure (0-640 MPa). For the smallest thicknesses of the Si pellets, the pressure dependence of conductivity may be described using models based on effective medium theory or strongest stresses network. For largest Si thicknesses, it exists an inhomogeneous distribution of pressure in the granular medium as a consequence of arching effects. It is shown that the conductivity variation with Si powder thickness may be understood using a distribution of conductivity induced by the distribution of pressure. Finally, it is shown that the conductivity of the sintered Si pellets is correlated with the uniaxial compression step.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e20020063
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  • 3
    Digitale Medien
    Digitale Medien
    The Bethe lattice spin glass revisited (2001)
    Springer
    The European physical journal 20 (2001), S. 217-233 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 75.10.Nr Spin-glass and other random models
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: So far the problem of a spin glass on a Bethe lattice has been solved only at the replica symmetric level, which is wrong in the spin glass phase. Because of some technical difficulties, attempts at deriving a replica symmetry breaking solution have been confined to some perturbative regimes, high connectivity lattices or temperature close to the critical temperature. Using the cavity method, we propose a general non perturbative solution of the Bethe lattice spin glass problem at a level of approximation which is equivalent to a one step replica symmetry breaking solution. The results compare well with numerical simulations. The method can be used for many finite connectivity problems appearing in combinatorial optimization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00011099
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  • 4
    Digitale Medien
    Digitale Medien
    The ± J spin glass in Migdal-Kadanoff approximation (2001)
    Springer
    The European physical journal 21 (2001), S. 589-594 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 75.10.Nr Spin-glass and other random models
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We study the low-temperature phase of the three-dimensional ± J Ising spin glass in Migdal-Kadanoff approximation. At zero temperature, T = 0, the properties of the spin glass result from the ground-state degeneracy and can be elucidated using scaling arguments based on entropy. The approach to the asymptotic scaling regime is very slow, and the correct exponents are only visible beyond system sizes around 64. At T 〉 0, a crossover from the zero-temperature behaviour to the behaviour expected from the droplet picture occurs at length scales proportional to T -2/ds where ds is the fractal dimension of a domain wall. Canonical droplet behaviour is not visible at any temperature for systems whose linear dimension is smaller than 16 lattice spacings, because the data are either affected by the zero-temperature behaviour or the critical point behaviour.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100510170169
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  • 5
    Digitale Medien
    Digitale Medien
    Rate of creation of the contacts between grains in a loose array of particles submitted to an uniaxial pressure (2001)
    Springer
    The European physical journal 21 (2001), S. 507-510 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 45.70.Cc Static sandpiles; granular compaction – 72.80.Tm Composite materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Macroscopic resistivity measurements have been performed on TiC/Al2O3 random mixtures submitted to uniaxial compression (0-95 kN). Such a random mixture exhibits an insulator-conductor transition which appears at increasing force while decreasing the conductive composition of the TiC/Al2O3 mixture. It is demonstrated that the conductivity behavior may be understood in the framework of a site percolation model. Finally, the rate of creation of the contacts between conductive grains is extracted from the macroscopic resistivity measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100510170160
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