Crystal stability and optical properties of organic chain compounds

Details Crystal stability and optical properties of organic chain compounds Crystal stability and optical properties of organic chain compounds

1998-12-11

arxiv.org/abs/cond-mat/9812194v1

Physics

Condensed Matter

7 pages, 1 figure, to be published in Europhysics Letters

Scientific paper

10.1209/epl/i1999-00145-8

The solution to the long standing problem of the cohesion of organic chain compounds is proposed. We consider the tight-binding dielectric matrix with two electronic bands per chain, determine the corresponding hybridized collective modes, and show that three among them are considerably softened due to strong dipole-dipole and monopole-dipole interactions. By this we explain the unusual low frequency optical activity of TTF-TCNQ, including the observed 10meV anomaly. The softening of the modes also explains the cohesion of the mixed-stack lattice, the fractional charge transfer almost independent of the material, and the formation of the charged sheets in some compounds.

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