水素結合型強誘電体におけるトンネリングモデル: 実験的側面

抄録

Although the proton-tunneling model is an elegant idea to explain an isotope effect on the ferroelectric phase transition temperature of hydrogen-bonded ferroelectrics such as KDP and DKDP, there is no evidence of proton tunneling phenomena in these crystals from the experimental point of view. The dynamical mechanism of ferroelectric phase transition in this kind of crystals is order-disorder type of distorted PO₄ tetrahedrons and the proton-tunneling idea has been broken down. The isotope effect can be explained in association with the difference of the zero point vibration energy between H and D atoms in an asymmetric potential.