Comment on the Ferroelectricity of Perovskite-Structure Crystals

概要

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The phenomenon of the overdamping of the soft phonons in several perovskite-structure crystals such as BaTiO3 is discussed in relation to the potential parametersfor the microscopic order-parameter. The lower potential barrier (which is due to thelarge 6-th-order potential term) for a microscopic order parameter gives much higherhopping rate of order parameter. The rapid hopping of' the order parameter gives theDebye-relaxation type profile in optical (and neutron) scattering spectrum, maskingthe spectrum from a resonance-type soft phonon. Also, the relationship between theoverdamped soft phonon and successive transitions observed such as in Basic. isgiven.
社団法人日本物理学会の論文
1992-03-15