Polar Order in Quantum Paraelectric SrTi^<16>O_3 and SrTi^<18>O_3 at Low Temperature (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Optical second-harmonic generation (SHG) in SrTi^<16>O_3 (STO16) and SrTi^<18>O_3 (STO18) was investigated using the SHG microscope. While no biased STO16 exhibits weak and almost temperature-independent SHG signals, a marked SHG is observed under the electric field in the quantum paraelectric region. In STO18, strong SHG signals appear spontaneously below 36 K. However, neutron and X-ray diffraction analyses indicate that no structural change appears at low temperature in STO18, or STO16 under the electric field. By taking into account the fact that the SHG is sensitive to the local polar order, the combined studies reveal that the long-range order of the polar phase does not develop on either crystal and is frozen in local regions.
- 社団法人日本物理学会の論文
- 2004-05-15
著者
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ITOH Mitsuru
Materials and Structures Laboratory, Tokyo Institute of Technology
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UESU Yoshiaki
Department of Physics, Waseda University
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KIAT Jean-Michel
Laboratoire de Chimie-Physique du Solide
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Kiat Jean-michel
Laboratoire Structures Proprietes Et Modelisation Des Solides Ecole Centrale
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Uesu Y
Waseda Univ. Tokyo Jpn
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Uesu Yoshiaki
Department Of Physics Waseda University:advanced Research Center For Science And Engineering Waseda
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Uesu Yoshiaki
Depart. Phys. Waseda Univ.
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Itoh Mitsuru
Materials & Structures Laboratory Tit
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NAKAI Ryuhei
Department of Geriatric Medicine, Kyorin University, School of Medicine
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KYOMEN Toru
Materials and Structures Laboratory, Tokyo Institute of Technology
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MENORET Carole
Laboratoire Structures, Proprietes et Modelisation des Solides, Ecole Centrale Paris
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Kyomen T
Materials And Structures Laboratory Tokyo Institute Of Technology
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Kyomen Toru
Materials And Structures Laboratory Tokyo Institute Of Technology
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Nakai Ryuhei
Department Of Geriatric Medicine Kyorin University School Of Medicine
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Nakai Ryuhei
Department Of Physics Waseda University
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Menoret Carole
Laboratoire Structures Proprietes Et Modelisation Des Solides Ecole Centrale Paris
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