Does the dynamics of metallic and insulating liquids really differ? A \"golden\" answer from neutrons and simulations (Abstract/Comunicazione in atti di convegno)

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  • Does the dynamics of metallic and insulating liquids really differ? A \"golden\" answer from neutrons and simulations (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • E. Guarini (1); U. Bafile (2); F. Barocchi (1); A. De Francesco (3); E. Farhi (4); F. Formisano (3); A. Laloni (3); A. Orecchini (4,5); A. Polidori (5), M. Puglini (1); F. Sacchetti (5) (2013)
    Does the dynamics of metallic and insulating liquids really differ? A "golden" answer from neutrons and simulations
    in FisMat 2013, Italian National Conference on Condensed Matter Physics (including Optics, Photonics, Liquids, Soft Matter), Milano, 9-13 settembre 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E. Guarini (1); U. Bafile (2); F. Barocchi (1); A. De Francesco (3); E. Farhi (4); F. Formisano (3); A. Laloni (3); A. Orecchini (4,5); A. Polidori (5), M. Puglini (1); F. Sacchetti (5) (literal)
Pagina inizio
  • abstract #392, [190] (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • FisMat 2013, Italian National Conference on Condensed Matter Physics (including Optics, Photonics, Liquids, Soft Matter), Milano, 9-13 settembre 2013 and the Conferences of the Italian Society for Synchroton Radiation Light (SILS) and of the Italian Society for Neutron Spectroscopy (SISN). Oral contribution by Eleonora Guarini: Soft Matter and Complexity A. Thursday, 12 September. (literal)
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  • http://www.fisi.polimi.it/it/fismat20 (literal)
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  • FisMat 2013, Italian National Conference on Condensed Matter Physics (literal)
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  • Book_of_ abstracts (literal)
Note
  • Comunicazione (literal)
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  • (1) Dipartimento di Fisica e Astronomia, Università di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy (2) Consiglio Nazionale Delle Ricerche, Istituto Dei Sistemi Complessi, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy (3) Consiglio Nazionale Delle Ricerche, Istituto Officina Dei Materiali, C/o Institut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex, France (4) Institut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex, France (5) Dipartimento di Fisica, Università di Perugia, via A. Pascoli, I-06123 Perugia, Italy (literal)
Titolo
  • Does the dynamics of metallic and insulating liquids really differ? A \"golden\" answer from neutrons and simulations (literal)
Abstract
  • The knowledge about the microscopic dynamics of a fluid at equilibrium has, in the years, been increased by neutron or X-rays spectroscopic investigations of liquid metals. Indeed, these are the emblem of \"simple fluids\", notwithstanding basic differences from rare-gas liquids, such as the existence of an electron gas, the high sound velocity (around and above 2000 m/s, typically), and the greater, sometimes naked-eye, visibility of collective modes in the S(Q,\omega) spectra, even at wave vectors near the position of the maximum in the static structure factor. Experimental evidences that the mentioned visibility of longitudinal acoustic modes is not so peculiar of liquid metals were found only in recent years, when similar features were also observed in insulating liquids and in comparable Q ranges. However, studying monatomic systems like liquid metals remains a main route to the core of collective dynamics in liquids. We present here a recent neutron study of a metal still unknown from the dynamic point of view: liquid gold. Experimental difficulties, mainly related to the high melting temperature and the considerable neutron absorption of gold, turned out to be not critical and allowed a first neutron Brillouin scattering experiment (0.6 < Q < 1.6 Å-1) on the BRISP spectrometer at the Institut Laue-Langevin (ILL) in Grenoble. The measurement had golden issues in many respects since it provided clean inelastic spectra rarely gifted by neutron scattering. The quality of the data thus allowed a significant comparison with recent ab initio simulations performed by the ILL Computing for Science group. The agreement found between simulation and experiment justified the further analysis of liquid gold dynamics at the higher Q-values probed by simulations (up to 7 Å-1) and led to conclude that the relevant dynamic features of the system, or of other liquid metals such as cadmium, do not substantially differ from those of insulating liquids, like methane and carbon dioxide. A very different opinion has long been wide-spread in the scientific community. (literal)
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