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Lattice dynamics of lead: An elastic force model approach
Author(s) -
Gupta H. C.,
Tripathi B. B.
Publication year - 1971
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.2220450126
Subject(s) - phonon , lattice (music) , physics , london dispersion force , dispersion (optics) , dynamics (music) , debye , condensed matter physics , classical mechanics , mechanics , optics , quantum mechanics , molecule , van der waals force , acoustics
The lattice dynamics of lead is discussed within the framework of elastic force models which include volume forces in addition to the central and the angular ones. The volume forces have been taken on the lines of Sharma and Joshi, while both Clark, Gazis, and Wallis (CGW) type of angular forces and that of de Launey (DAF) type have been used. The results of the phonon dispersion curves and the Debye temperatures have been compared with the experimental ones. The agreement obtained with both the angular force models is satisfactory. In the phonon dispersion curves, Kohn anomalies are seen using the DAF type angular force model but not using the CGW type. It is shown that the CGW model gives better results than the DAF one.