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Dynamical Correlations and Phonon Dispersion in a Liquid Binary Alloy
Author(s) -
Bhandari D.,
Pratap A.,
Saxe. S.,
Saksena M. P.
Publication year - 1992
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221700207
Subject(s) - mean squared displacement , phonon , autocorrelation , dispersion (optics) , condensed matter physics , physics , harmonic , alloy , brownian motion , displacement (psychology) , materials science , quantum mechanics , molecular dynamics , mathematics , psychology , statistics , composite material , psychotherapist
Theory of Brownian motion of particles in static harmonic well approximation is applied to study the vibrational dynamics of liquid Na x Cs 1− x ( x = 0.5; 0.85) alloys. Dynamical variables like velocity autocorrelation function, power spectrum, and the mean square displacement are computed. The effective interatomic potential of the alloy used is obtained through the pair‐potentials of individual components. The co‐operative motion of atoms is described in terms of spectral functions of longitudinal current–current correlation functions which are obtained through the mean square displacement. These spectral functions of longitudinal current–current correlations are then used to get phonon dispersion in the alloy. The results are compared with the recently reported quasi‐dispersion results of neutron inelastic scattering (NIS) experiments. Good qualitative agreement is observed.