Abstract
Dielectric measurements on the ferroelectric CsH2PO4 with chain-like hydrogen bonds have been performed in the frequency region below 1 GHz. The temperature dependence of the dielectric constant and loss were explained well by the Debye equation with single relaxation time. The relaxation time obtained near the ferroelectric phase transition point exhibits a pronounced critical slowing down. This characteristic divergence of relaxation time has been explained very well using the results of the pseudo-one-dimensional kinetic Ising model. The parameters obtained in this experiment have considerable anisotropy of interactions: J/sub ////k=234K of intrachain and Jperpendicular to /k=6.78K of interchain. The marked long relaxation time compared with that of KH2PO4 is well understood with the critical dynamics of the hydrogen motion in the weakly-coupled one-dimensional chains.
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