Abstract
In halogen-bridged mixed-valence transition-metal complexes, a new theoretical viewpoint is to control the phonon properties by taking into account the cooperative electron-proton coupling. Developing a cluster theory, proton-induced ordering is predicted to occur among one-dimensional charge-density-wave (CDW) chains (in-phase or out-of-phase). It is discussed that the intra-chain CDW state derived from the competition between electron-phonon and electron-electron interactions can be changed by the proton motion on the interchain hydrogen bonds.
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