Polarization Gradient Coefficients and the Dispersion Surface of the Soft Mode in Perovskite Ferroelectrics

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概要

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• The gradient coefficients in the Landau-Ginzburg theory are crucial for quantitative description of domain walls in ferroelectrics. The magnitude of these gradient coefficients are a measure of nonlocal coupling strength of the polarization. In this paper, we intend to explain the physical meaning of these gradient coefficients in terms of lattice dynamics and give some relationships between these gradient coefficients and the dispersion surface of the soft mode. The implications for the study of over damped soft modes are also discussed.

• 社団法人日本物理学会の論文
• 1994-03-15

著者

• Cao W

  Materials Research Laboratory The Pennsylvania State University

• Cao Wenwu

  Materials Research Laboratory The Pennsylvania State University University Park

• Cao Wenwu

  Materials Research Institute The Pennsylvania State University

関連論文

• The Ratio of Rhombohedral and Tetragonal Phases on the Morphotropic Phase Boundary in Lead Zirconate Titanate
• Polarization Gradient Coefficients and the Dispersion Surface of the Soft Mode in Perovskite Ferroelectrics
• Optical Thermometry through Green Upconversion Emissions in Er^/Yb^-Codoped CaWO_4 Phosphor

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