Effect of Oxygen Isotope Exchange on Ferroelectric Microregion in SrTiO₃Studied by Raman Scattering

• Taniguchi Hiroki

  Research Institute for Electronic Science, Hokkaido University

• Takesada Masaki

  Department of Physics, School of Science, Hokkaido University

• Itoh Mitsuru

  Materials and Structure Laboratory, Tokyo Institute of Technology

• Yagi Toshirou

  Research Institute for Electronic Science, Hokkaido University

書誌事項

タイトル別名

• Effect of Oxygen Isotope Exchange on Ferroelectric Microregion in SrTiO3 Studied by Raman Scattering

抄録

The ferroelectric microregion (FMR) in quantum paraelectric SrTiO₃ is studied by Raman scattering using an optical cryostat with a ³He refrigerator. By the partial exchange of the oxygen atom for its isotope ¹⁸O, broad FMR spectra change drastically to underdamped Lorentzian-type spectra with decreasing temperature below 10 K. The peak is assigned to the ferroelectric soft Eu mode. The intense and sharp spectra of the Eu mode, which are nominally Raman inactive, indicate that the symmetry is lowered to a non-centrosymmetric symmetry in FMR. Furthermore, the softening characteristic of the soft Eu mode in a low-temperature region implies that the symmetry is not necessarily ferroelectric. The local symmetry breaking is enhanced by the substitution of the isotope ¹⁸O.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 73 (12), 3262-3265, 2004

  一般社団法人 日本物理学会

キーワード

• SrTiO<SUB>3</SUB>
• strontium titanate
• quantum paraelectric
• FMR
• isotope effect
• Raman scattering
• low temperature

詳細情報

• CRID: 1390001204188429568
• NII論文ID: 210000105187
• NII論文ID: 110001979292
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.73.3262
• BIBCODE: 2004JPSJ...73.3262T
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7185881
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7185881
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.73.3262
• 本文言語コード: en
• データソース種別:
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