Isotope Effect on Photoconductivity in Quantum Paraelectric SrTiO_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Photoconductivity and various photo-magnetotransport properties have been studied in quantum paraelectric SrTiO_3 crystals. SrTi^<16>O_3 shows giant photoconductivity, as reported before. The photodoped carrier in the ^<16>O system is of electron type and has high mobility beyond 10^4 cm^2 V^<-1> s^<-1> at 5 K. Its number can reach the order of 10^<15>cm^<-3>. In contrast, isotope-substituted SrTi^<18>O_3 is not a good photoconductor. In addition, the photocarrier's mobility in the ^<18>O sample is negligibly small. These results suggest a strong correlation between the quantum fluctuation and the giant photo-conductivity in this quantum paraelectric system. In other words, the study of photocarrier dynamics is a novel approach to the investigation of quantum fluctuation in dielectric materials.
- 社団法人日本物理学会の論文
- 2004-07-15
著者
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ITOH Mitsuru
Materials and Structures Laboratory, Tokyo Institute of Technology
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Koshihara Shin-ya
ERATO JST
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Itoh Mitsuru
Materials & Structures Laboratory Tit
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Takesada Masaki
Research Institute for Electronic Science, Hokkaido University
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Ishikawa T
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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ISHIKAWA Tadahiko
Department of Chemistry and Materials Science, Tokyo Institute of Technology
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KURITA Masaaki
Department of Chemistry and Materials Science, Tokyo Institute of Technology
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SHIMODA Hiroaki
Department of Chemistry and Materials Science, Tokyo Institute of Technology
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SAKANO Yohei
Department of Chemistry and Materials Science, Tokyo Institute of Technology
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Sakano Yohei
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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Kurita Masaaki
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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Takesada Masaki
Research Institute For Electronic Science Hokkaido University
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Shimoda Hiroaki
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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Koshihara Shin-ya
Department Of Applied Physics Faculty Of Science Tokyo Institute Of Technology
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Ishikawa Tadahiko
Department Of Applied Physics University Of Tokyo
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