Frequency spectra of disordered metals: especially liquid Rb (Articolo in rivista)

Type
Label
  • Frequency spectra of disordered metals: especially liquid Rb (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Angilella, GGN; March, NH; Tosi, MP (2006)
    Frequency spectra of disordered metals: especially liquid Rb
    in Physics and chemistry of liquids (Print)
    (literal)
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  • Angilella, GGN; March, NH; Tosi, MP (literal)
Pagina inizio
  • 107 (literal)
Pagina fine
  • 114 (literal)
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  • 44 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Catania, Dipartimento Fis & Astron, I-95123 Catania, Italy; Ist Nazl Fis Nucl, Sez Catania, Catania, Italy; UdR Catania, Catania, Italy; Univ Oxford, Oxford, England; Univ Antwerp, Dept Phys, B-2020 Antwerp, Belgium; Scuola Normale Super Pisa, I-56126 Pisa, Italy; NEST INFM CNR, I-56126 Pisa, Italy (literal)
Titolo
  • Frequency spectra of disordered metals: especially liquid Rb (literal)
Abstract
  • The phonon frequency spectrum g(omega) of a crystal, such as body centred cubic (bee) Rb, is known to be characterized by the Van Hove singularities at omega not equal 0. However, for a liquid metal like Rb, g(w) has a single, hydrodynamic-like singularity, namely it cusp proportional to omega((1/2)), at omega = 0. Here, we note first that computer simulation on liquid Rb near freezing has revealed a rather well-defined Debye frequency omega(D). Therefore, we propose here it zeroth-order model g(0)(omega) of g(omega) for Rb, which combines the Debye model with the 'hydrodynamic' omega((1/2)) cusp. The corresponding velocity autocorrelation function (v(t) . v(0)) has correctly a long-time tail proportional to t(-(3/2)). The terms from g(0)(omega) involving omega(D) are then damped by weak exponential factors exp(-alpha(i)t), and the resulting first-order approximation, g(t)(omega) say, to the frequency spectrum is found to have features in common with the molecular dynamics (MD) simulation form. Thus omega(D) is fixed, as well as transport coefficients for the known thermodynamic state. The article concludes with a more qualitative discussion on supercooled liquids, and on metallic glasses such as Fe, for which MD simulations exist. (literal)
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