Dynamical Susceptibility in KDP-type Crysals above and below T_c II(General)

概要

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The path probability method (PPM) in the tetrahedron-cactus approximation is applied to the Slater-Takagi model with dipole-dipole interaction for KH_2PO_4-type hydrogen-bonded ferroelectric crystals in order to derive a small dip structure in the real part of dynamical susceptibility observed at the transition temperature T_c. The dip structure can be ascribed to finite relaxation times of electric dipole moments responsible for the first order transition in contrast with the critical slowing down in the second order transition. The light scattering intensity which is related to the imaginary part of dynamical susceptibility is also calculated above and below the transition temperature and the obtained central peak structure is consistent with polarization fluctuation modes in Raman scatterin experiments.
社団法人日本物理学会の論文
2003-01-15