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Identification of conduction due to the spontaneous electron layer on the clean free surface of ferroelectric

Research Project

Project/Area Number 13640334
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionKyushu University

Principal Investigator

WATANABE Yukio  Kyushu University, Department of Physics, Professor, 理学研究院, 教授 (40274550)

Co-Investigator(Kenkyū-buntansha) TOYAMA Naotake  Kyushu Institute of Technology, Department of Electronics, Associate Professor, 工学部, 助教授 (10039117)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
Keywordsferroelectrics / surface / nano / transition metal oxides / polarization / nanometer-scale / 2次元電子系
Research Abstract

The large size effect of ferroelectric is probably due to its unique surface rather than to an intrinsic/essential limitation. The present study clarifies the fundamental properties of a possible new two dimensional electron phase coupled strongly with lattice that is expected to exist on the top surface of the ferroelectric and determine its minimum size limit. This electron phase is expected to exhibit novel phenomena such as unusual electron conduction.
We have suggested that the large size effect of ferroelectric and the limitations of FET-type ferroelectric non-volatile memories are probably due to its unique surface rather than to an intrinsic limitation. The present study have attempted to clarify the fundamental properties of a possible new two dimensional electron phase coupled strongly with lattice that is expected to exist on the top surface of the ferroelectric and determine its minimum size limit. This electron phase is expected to exhibit novel phenomena such as unusual electron conduction as well as the response to UV light and the possibility of UV emission and electron emission, leading to a new research area of ferroelectrics. The existence of this hypothetic electron layer and some of these properties are experimentally confirmed by measuring the surface conduction of pure BaTiO_3 single crystals in ultrahigh vacuum. Moreover, we found a new atomic force microscopy to observe 180° domains utilizing the properties of surface electron layer.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Y.Watanabe, A.Masuda: "Nano-scale theory of Ferroelectric surface predicting skin-deep auantized 2D electron gas"Ferroelectrics. 267. 379-384 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe, M.Tanamura: "Element Sensitive Atom Beam Etching Based on Projectile Mass"Appl.Surf.Science. 207・1-4. 287-294 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Tanamura, H.Kida, Y.Watanabe, N.Toyama: "A NEW APPROACH OF ELEMENT SENSITVE ION BEAM ETCHING BASED ON MASS DEPENDENCE OF SPUTTERING FOR METAL OXIDES"J.Korean Phys.Soc.. (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Okano, Y.Watanabe, N.Toyama: "Anomaly in temperature dependence of current voltage characteristics of BaTiO_3 ferroelectric frozen phase"J.Korean Phys.Soc.. (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe, J.G.Bednorz et al.: "Current-driven insulator-conductor transition and nonvolatile memory in chromium-doped SrTiO_3 single crystals"Appl.Phys.Lett.. 78(23). 3738-3740 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe, A.Masuda: "Theoretical Stability of Polarization in Metal/Ferroelectric Insulator /Semiconductor and Related Structure"Jpn.J.Appl.Phys.. 40(9B). 5610-5614 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 渡部: "ナノ強誘電体のサイズ効果とは何か?-極微小化から見る強誘電性基礎-"固体物理. 38(2). 1-14 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe, et al.: "Summary of Symposium "What is the finite size effect in nano-structures of transitionmetal oxides and ferroelectrics""BUTSURI(bulletin of the Physical Society of Japan). 57(2). 112-112 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe and A.Masuda: "Theoretical Stability of Polarization in Metal/Ferroelectric Insulator /Semiconductor and Related Structure"Jpn.J.Appl.Phys.. 40(9B). 5610-5614 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe, J.G.Bednorz, et al.: "Current-driven insulator-conductor transition and nonvolatile memory in chromium-doped SrTiO_3 single crystals"Appl.Phys.Lett.. 78(23). 3738-3740 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe and A.Masuda: "Nano-scale theory of Ferroelectric surface predicting skin-deep quantized 2D electron gas"Ferroelectrics. 267. 379-384 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Okano, Y.Watanabe, and N.Toyama: "Anomaly in temperature dependence of current voltage characteristics of BaTiO_3 ferroelectric frozen phase"J.Korean Phys.Soc.. (accepted for publication).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Tanamura, H.Kida, Y.Watanabe, and N.Toyama: "A NEW APPROACH OF ELEMENT SENSITVE ION BEAM ETCHING BASED ON MASS DEPENDENCE OF SPUTTERING FOR METAL OXIDES"J.Korean Phys.Soc.. (accepted for publication).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe and M.Tanamura: "Element Sensitive Atom Beam Etching Based on Projectile Mass"Appl.Surf.Science. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe: "What is the finite size effect in nano-ferroelectrics? - Fundamental issues in ferroelectrics elucidated by the miniaturization"Kotai Butsuri. 38(2). 1 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe: "Summary of symposium "What is the finite size effect in nano-structures of transition metal oxides and ferroelectrics""BUTSURI (bulletin of the Physical Society of Japan). 57(2). 112 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Watanabe, A.Masuda: "Nano-scale theory of Ferroelectric surface predicting skin-deep quantized 2D electron gas"Ferroelectrics. 267. 379-384 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Watanabe, M.Tanamura: "Element Sensitive Atom Beam Etching Based on Projectile Mass"Appl. Surf. Science. (未定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Tanamura, H.Kida, Y.Watanabe, N.Toyama: "A NEW APPROACH OF ELEMENT SENSITVE ION BEAM ETCHING BASED ON MASS DEPENDENCE OF SPUTTERING FOR METAL OXIDES"J. Korean Phys. Soc.. (未定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Okano, Y.Watanabe, N.Toyama: "Anomaly in temperature dependence of current voltage characteristics of BaTiO_3 ferroelectric frozen phase"J. Korean Phys. Soc.. (未定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 渡部 行男: "ナノ強誘電体のサイズ効果とは何か?-極微小化から見る強誘電性基礎-"固体物理. 38・2. 1-14 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Watanabe et al.: "Current-driven insulator-conductor transition and nonvolatile memory in chromium-doped SrTiO_3 single crystals"Appl. Phys. Lett.. 78・23. 3738-3790 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Watanabe, A.Masuda: "Theoretical Stability of polarization in metul/Femoelectric/Insnlatics/Semi conduction and Relation structure"Jpn. J. Appl. Phys.. 40・9B. 5610-5614 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Watanabe: "Possibility of 2 Delectrongus on free ferroelectric surface and its ellect on domain and size limit"Ferroelectrics. 259. 21-26 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Watanave et al.: "Size effect study by Bulk Crystals : optical and de dielectric repose of oxygen vacant BaTiO_3"Ferroelectrics. 259. 37-42 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2020-05-15  

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