Reference Force Field and CDW Amplitude of Mixed-Valence Halogen-Bridged Pt Complexes

Details Reference Force Field and CDW Amplitude of Mixed-Valence Halogen-Bridged Pt Complexes Reference Force Field and CDW Amplitude of Mixed-Valence Halogen-Bridged Pt Complexes

1994-12-16

arxiv.org/abs/cond-mat/9412082v2

Physics

Condensed Matter

10 pages, compressed postscript, 6 Tables and 5 Figures also in a compressed ps.Z file. Revision is in the submission format o

Scientific paper

10.1103/PhysRevB.51.17338

The spectroscopic effects of electron-phonon coupling in mixed-valence chlorine-bridged Pt chains complexes are investigated through a parallel infrared and Raman study of three compounds with decreasing Pt-Pt distance along the chain. The e-ph interaction is analyzed in terms of the Herzberg-Teller coupling scheme. We take into account the quadratic term and define a precise reference state. The force field relevant to this state is constructed, whereas the electronic structure is analyzed in terms of a simple phenomenological model, singling out a trimeric unit along the chain. In this way we are able to account for all the available optical data of the three compounds, and to estimate the relevant microscopic parameters, such as the e-ph coupling constants and the CDW amplitude.

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