Dynamical Properties of Protons in KH_2PO_4. II. : Isotope Effect on the Ferroelectric Phase Transition
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概要
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The effect of isotope replacement of deuteron for proton on the ferroelectric ordering process in KH_2PO_4 has been discussed based on the 'proton self-trapped state' model which has been recently proposed to describe the dynamical behavior of protons on the hydrogen bond. In this model, the tunneling two level scheme is precluded in the stable configuration of the lattice. Instead, the isotope effect is ascribed to the change in the adiabatic potential for phonons upon deuteration. The phase transition temperature T_c as well as the spontaneous polarization P_s have been explicitly given in terms of the coefficient of the lowest order expansion of the adiabatic potential with respect to the amplitudes of the phonon modes. The experimental isotope effects concerning T_c and P_s seem to evidence the validity of the present treatment.
- 社団法人日本物理学会の論文
- 1994-10-15
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