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Unambiguous Determination of Interatomic Force Constants of Crystals by Coherent Inelastic Neutron Scattering
Author(s) -
Kohl H.
Publication year - 1985
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.2221300112
Subject(s) - eigenvalues and eigenvectors , force constant , neutron , crystal (programming language) , inelastic neutron scattering , phonon , inelastic scattering , position (finance) , yield (engineering) , physics , cross section (physics) , differential (mechanical device) , atomic physics , scattering , neutron scattering , computational physics , optics , condensed matter physics , quantum mechanics , molecule , thermodynamics , finance , economics , computer science , programming language
The interatomic force constants in a crystal can be obtained experimentally by measuring both the frequency and a corresponding eigenvector of each phonon mode. The measurement of the double differential cross section does not generally suffice to determine the eigenvector unambiguously. It is shown that by orienting the crystal near a Bragg position it is possible to obtain additional information on the eigenvector. An experimental procedure is proposed which should yield unambiguous values for the force constants.