Micro-Raman spectroscopy is utilized to study the temperature dependence of domain structures in a high-quality BaTiO3 bulk crystal. For T=4-100 K, the spectra of the initially 90° domain wall region at room temperature exhibit the splitting of A1 mode at ~244 cm-1 with the appearance of an additional peak at ~263 cm-1, the behavior of which is different from that of a sharp peak observed at ~244 cm-1 in the single-domain region. The results imply that the strain fields exist in the domain walls at low temperatures, thus altering the local crystal symmetry.
|ジャーナル||Applied Physics Letters|
|出版ステータス||Published - 1999 11月 22|
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