ESR and ENDOR Investigations of the Ferroelectric BaMgF_4
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概要
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ESR and ENDOR measurements for Mn" ions doped in the ferroelectricBaMgF,? crystal were made. The Mn" ions are sazbstitutional for the Mg" ionsin the distorted MgF,; octahedra. The temperatttre dependence of crystal fieldtensor indicates that one MgF5 octahedron rotates clockwise about the c-axisand another adjacent octahedron rotates counterclockwise as the temperaturedecreases from the hypothetical Ctu'ie temperatu?re. It suggests that two sitesbecome equivalent in the hypothetical phase and the phase has Amam symmetry.The critical exponent value for the rotation angle<cf the crystal field tensor is 0.5.The normal modes of the lattice vibration in the hypothetical phase were analyzedand the structtu'e in the ferroelectric phase was discussed in connection with thefrozen u.. modes in the hypothetical phase.
- 一般社団法人日本物理学会の論文
- 1980-04-15
著者
-
Fukui Minoru
Department Of Applied Physics Faculty Of Engineering Nagoya University
-
Abe Ryuji
Department Fo Applied Physics Faculty Of Engineering Nagoya University
-
Chikushi Shunichi
Department Of Applied Physics Faculty Of Engineering Nagoya University
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