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Lattice dynamics of highly polarizable homopolar crystals with diamond structure
Author(s) -
Kress W.
Publication year - 1972
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.2220490122
Subject(s) - inelastic neutron scattering , materials science , isotropy , condensed matter physics , polarizability , neutron scattering , inelastic scattering , dielectric , shell model , small angle neutron scattering , diamond , molecular physics , scattering , physics , optics , atomic physics , quantum mechanics , composite material , molecule , optoelectronics
A modified shell model taking into account the isotropic deformation of the charge density is presented. In contrast to the usual 11‐parameters shell model which has to be fitted to inelastic neutron scattering data, the modified shell model needs only six parameters, five of which are related in a unique way to the macroscopic data (elastic constants, Raman frequency, dielectric constant) and the sixth may be obtained from the infrared absorption data. Therefore the modified model is mainly independent from the inelastic neutron scattering results and its parameters are related in a physical way to the macroscopic constants.