Proton dynamics in H-bonded ferroelectrics. II. Approximated solutions to the kinetic equations

Approximated solutions at T → ∞ and at Tc are proposed for the set of kinetic equations recently obtained to describe the dynamical behaviour of the pseudo-spin correlation functions of the tunnelling model in KDP ferroelectrics. At high temperatures, we predict a width comparable to the protonic-mode frequency, while at Tc the width is finite but much smaller. The existence of the finite width at vanishing protonic-mode frequency at Tc indicates the absence of dynamic scaling. © 1971.SCOPUS: ar.j