Model of electron-proton correlation in quasi-one-dimensional halogen-bridged mixed-valence complexes: Role of proton motion.

Abstract

The role of interchain hydrogen (H) bonds in one-dimensional electron systems is studied in halogen-bridged mixed-valence transition-metal complexes. A cluster theory is developed to predict the proton-induced ordering among charge-density-wave (CDW) chains in terms of pseudospin formalism for proton motion on H bonds. It is pointed out that the electron-proton coupling can control the CDW state which is produced from the competition between electron-electron and electron-phonon coupling.