Phase transitions and dynamical properties of quasi-one-dimensional   structures with hydrogen bonds
  The frequency dependence of dynamical conductivity of the quasi-one-dimensional structures with hydrogen bonds is studied on the basis of pseudospin-electron model. It takes into account the proton-electron interaction, external longitudinal field h, the tunneling hopping of protons, electron transfer and direct interaction between protons. The dependences of the electron concentration and mean number of protons at the site on temperature and external field are obtained. The phase transition lines from uniform phase into charge ordered phase are determined. The dependence of dynamical conductivity on temperature and field $h$ and its changes at the phase transitions are obtained. 
R.Ya. Stetsiv
cond-mat.stat-mech cond-mat.str-el