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  • 2000-2004  (1)
  • 1990-1994  (2)
  • Flows through porous media  (1)
  • Metal-insulator transitions  (1)
  • isotope effect  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Linear-response theory for partly quenched systems (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 169-175 
    Details
    ISSN: 0392-6737
    Keywords: Statistical theories of liquid structure ; Flows through porous media ; filtration ; seepage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The matrix of linear density response functions is constructed within density functional theory for a monatomic fluid adsorbed in a quenched material. The structural Ornstein-Zernike relations obtained by Given and Stell with the replica method are regained in the appropriate limit. The usefulness of the present reformulation of their theory is illustrated by deriving from it the free-energy functional and the structural closure relations in the hypernetted-chain approximation. The extension to dynamical properties of partly quenched systems is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451699
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A model for the metal-non-metal transition in metal-molten-salt solutions (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 307-310 
    Details
    ISSN: 0392-6737
    Keywords: Metal-insulator transitions ; Molten salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We outline a theory for the metal-non-metal transition occurring in solutions of alkali metals in molten alkali halides as governed by a balance between the binding of ionic clusters by localized electrons and the excess free energy of an ionic assembly screened by metallic electrons. In the model the transition is driven by the composition dependence of the screening length. The theory is amenable to an analytic solution within the mean spherical approximation when Thomas-Fermi screening is used and the ions are described by charged hard spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02463782
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Plasmon–Phonon Pairing Mechanism and Superconducting State Parameters in Layered Mercury Cuprates (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 593-601 
    Details
    ISSN: 1572-9605
    Keywords: pairing mechanism ; transition temperature ; isotope effect ; cuprates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An effective two-dimensional dynamic interaction is developed which incorporates screening of holes by plasmons and by optical phonons to discuss the nature of the pairing mechanism leading to superconductivity in layered mercury cuprates. The system is treated as an ionic solid containing layers of charge carriers and a model dielectric function is set up which fulfils the appropriate sum rules on the electronic and ionic polarizabilities. The static limit of the model dielectric function is used to calculate the effective hole-hole coupling strength. The values of the electron-phonon coupling strength and of the Coulomb interaction parameter indicate that the superconductor is in the strong coupling regime with effective screening of the charge carriers. The superconducting transition temperature of optimally doped HgBa2CuO4+δ is estimated as 120 K from Kresin's strong coupling theory and the energy gap ratio is substantially larger than the BCS value. The value of the isotope exponent is severely reduced below the BCS value. The implications of the model and its analysis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007829018708
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    Paper (German National Licenses)
    Fulltext
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