Density Correlation of Classical 1-d Electron Gas with Referecne to the 4K_FAnomaly in TTF-TCNQ

概要

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The intensity of the X-ray diffuse scattering from an electron-phonon system iscalculated correct up to the second order of the electron-phonon interaction. The resultconsists of two terms: one is described as arising from softening of the phononfrequency due to the interaction, and the otlter as the shift of the center of the phononcoordinate. The formcr dominates when the electronic motion is faster than the phononmotion, and vice versa. It is argued that for a strongly Coulomb-correlated electronsystem, such as TTF-TCNQ, the electronic motion is slow enough to make the lattercontribution important. A simple model for TTF-TCNQ is presented, which neglectsthe electron transfcr entirely and for which the latter term is expressed in terms of thedensity correlation function of the electron system. This is calculated by applying theMonte Carlo method to a finite linear chain and also by using the hypernetted chainequation. We find a peak in the correlation function at q=4k, which explains the 4k,anomaly in the X-ray diffuse scattering found by Kagoshjma, Ishiguro and Anzai.
社団法人日本物理学会の論文
1977-08-15