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Light Scattering from Surfaces near Phase Transition Points
Author(s) -
Filho A. Ribeiro,
Tilley D. R.,
Albuquerque E. L.,
Almeida N. S.,
Oliveros M. C.
Publication year - 1984
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.2221240202
Subject(s) - physics , phase transition , light scattering , scattering , phenomenological model , boundary value problem , function (biology) , inelastic scattering , spectral density , phase (matter) , phase boundary , mathematical analysis , statistical physics , classical mechanics , condensed matter physics , quantum mechanics , mathematics , evolutionary biology , biology , statistics
A semi‐infinite medium with a one‐component order parameter η is considered. It is assumed that the free energy density is given by a simple Landau‐type expansion in η, that the boundary condition is linear in η and Δη, and that fluctuations in the dielectric function depend linearly on fluctuations in η. With the useof phenomenological equations of motion the order‐parameter Green function is derived. Expressions are given, and illustrated numerically, for the power spectrum of order‐parameter fluctuations and the cross section for inelastic light scattering.