A Method of Dynamical Structure Analysis and Its Application to Calcium Fluoride

概要

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The intensity of the one-phonon coherent scaattering of themal neutrons is analyzed to determine the phonon eigenvectors necessary for deciding the harmonic force constants uniquely. Corrections on the integrated intensities to obtain the inelastic structure factors (ISF) are given and the general properties of ISF are discussed. ISF of phonons which transform according to a certain row of an irreducible representation of the space group are analyzed en bloc and are interpreted with the symmetry coordinates which, combined with the phonon energies, determine the elements of the block-diagonalized dynamical matrix. Measurements have been made for the three Σ_3 branches of calcium fluoride and the analysis is presented as an example. Measured ISF, symmetry coordinates and elements of the dynamical matrix are compared with those calculated with the models. No definite conclusion can be reached concerning the forces due to the limited accuracy of the measurements.
社団法人日本物理学会の論文
1972-09-05