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Electronic States in Two-dimensional Quasicrystals

Research Project

Project/Area Number 06452054
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionInstitute for Solid State Physics, Univ.of Tokyo

Principal Investigator

TAKEUCHI Shin  Univ.of Tokyo, Institute for Solid State Physics, Professor, 物性研究所, 教授 (60013512)

Co-Investigator(Kenkyū-buntansha) SUZUKI Kunio  Univ.of Tokyo, Institute for Solid State Physics, Research Associate, 物性研究所, 助手 (50107439)
EDAGAWA Keiichi  Univ.of Tokyo, Institute of Industrial Science, Lecturer, 生産技術研究所, 講師 (20223654)
MAEDA Koji  Univ.of Tokyo, Dept.Appl.Phys., Prof., 工学部, 教授 (10107443)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1994: ¥5,100,000 (Direct Cost: ¥5,100,000)
KeywordsQuasicrystal / Decagonal Phase / Electronic States / Scanning Tunneling Microscopy / Electron Localization / 走査トンネル分光
Research Abstract

1.High-order approximant crystals of decagonal phase with lattice constants of a few nm have been produced for Al-Pd-Fe and Al-Co systems. The resistivity along the c-axis of these approximant crystals shows a metallic behavior, while the resistivity in the pseudo-quasicrystalline plane is an order higher than that along the c-axis and exhibits very small temperature dependence. These results are essentially the same as those of decagonal quasicrystals previously obtained, and are consistent with the theoretical results obtained by Fujiwara et al.in whihc the high resistivity in the (pseudo-) quasicrystalline plane is attributed to a very large effective mass of electrons as a result of localization of wavefunctions in atomic cluster columns along the c-axis.
2.Scanning tunneling microscopy (STM) observation has been made for single crystals of an Al-Co-Ni decagonal quasicrystals produced by slow solidification from the melt. Observation has been made for tenfold-symmetric plane of the decagonal quasicrystal after Ar-ion sputtering and anealing. STM image has been obtained with a bias voltage of -0.1V and a set-current of 1nA.STM images often showed an irregular mottled pattern with a wavelength of a few nm. The pattern is quite similar to that of spatial distribution of the amplitude of the wavefunction of elctrons near the Fermi-level theoreticaly calculated by Fujiwara et al.and hence the observed pattern is considered to reflect the spatial localization of electrons.
Thus, the special electronic states in two-dimensional quasicrystals have been experimentally clarified to a large extent.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (36 results)

All Other

All Publications (36 results)

  • [Publications] K. Edagawa: "Order-disorder Transformation in an Al-Ni-Co Decagonal Quasicrystal" Philosophical Magaine Letlers. 69. 227-234 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Takeuchi: "Physical Properties of Quasicrystals-An Experimental Review-" Materials Science Forum. 150/151. 35-52 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K. Edagawa: "Superlattice Structure in Al-Ni-Co Decagonal Quasicrystal" Materials Science Forum. 150/151. 223-234 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Tei-Ohkawa: "Model Structure of Decagonal Quasicrystal and Comparison with Experiments" Materials Science Forum. 150/151. 287-296 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Tei-Ohkawa: "Atomic Packing Geometries and Lattice Properties of a Model Decagonal Phase" Materials Science and Engineering A. 181/182. 833-836 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 竹内 伸: "「準結晶」という新秩序物質とその物性" PETROTECH. 17. 556-561 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K. Edagawa: "Ordered and Disordered Phases in Al-Ni-Co Decagonal Quasicrystals" Physical Review B. 50. 12413-12420 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Shibuya: "Anisotropic Electrical Resistivity in an Al-Pd-Fe Decagonal Approximant Phase" "Quasicrystals" (World Scientific). 380-383 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K. Edagawa: "Superlattice Ordering in Al-Ni-Co Decagonal Quasicrystal" "Quasicrystals"(World Scientific). 322-329 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K. Edagawa: "HRTEM Study of Order-Disorder Structural Transformatim in Al-Ni-Co Decagonal Quasicrystal" "Aperiodic '94" (World Scientific). 351-355 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Edagawa et al.: "Order-disorder Transformation in an Al-Ni-Co Decagonal Quasicrystal" Phil.Mag.Lett.69. 227-234 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Takeuchi: "Physical Properties of Quasicrystals --An Experimental Review--" Mater.Sci.Forum. 150/151. 35-52 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Edagawa et al.: "Superlattice Structure in Al-Ni-Co Decagonal Quasicrystal" Mater.Sci.Forum. 150/151. 223-234 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Tei-Ohkawa et al.: "Model Structure of Decagonal Quasicrystals and Comparison with Experiments" Mater.Sci.Forum. 150/151. 287-296 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Tei-Ohkawa et al.: "Atomic Packing Geometries and Lattice Properties of a Model Decagonal Phase" Mater.Sci.& Engr.A. 181/182. 833-836 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Takeuchi: "New Ordered Material "Quasicrystals" and Their Physical Properties" PETROTCH. 17. 556-561 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Edagawa et al.: "Ordered and Disordered Phases in Al-Ni-Co Decagonal Quasicrystals" Phys.Rev.B. 50. 12413-12420 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Shibuya et al.: "Anisotropic Electrical Resistivity in an Al-Pd-Fe Decagonal Approximant Phase" "Quasicrystals" (World Scientific). 380-383 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Edagawa et al.: "Superlattice Ordering in Al-Ni-Co Decagonal Quasicrystal" "Quasicrystals" (World Scientific). 322-329 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Edagawa et al.: "HRTEM Study of Order-Disorder Structural Transformation in Al-Ni-Co Decagonal Quasicrystal" "Aperiodic '94" (World Scientific). 351-355 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Edagawa: "Order-disorder Transformation in an Al-Ni-Co Decagonal Quasicrystal" Philosophical Magazine Letters. 69. 227-234 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Takeuchi: "Physical Properties of Quasicrystals-An Experimental Review-" Materials Science Forum. 150/151. 35-52 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Tei-Ohkawa: "Model Structures of Decagonal Quasicrystals and Comparison with Experiments" Materials Science Forum. 150/151. 287-296 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Tei-Ohkawa: "Atomic Packing Geometries and Lattice Properties of a Model Decagonal Phase" Materials Science & Engineering A. 181/182. 833-836 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 竹内伸: "「準結晶」という新秩序物質とその物性" PETROTECH. 17. 556-561 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Edagawa: "Ordered and Disordered Phases in Al-Ni-Co Decagonal Quasicrystals" Physical Review B. 50. 12413-12420 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Shibuya: "Anisotropic Electrical Resistivity in an Al-Pd-Fe Decagonal Approximant Phase" "Quasicrystals" (World Scientific,Singapore). (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Edagawa: "Superlattice Ordering in Al-Ni-Co Decagonal Quasicrystal" "Quasicrystals" (World Scientific,Singapore). (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Edagawa: "HRTEM Study of Order-Disorder Structural Transformation in Al-Ni-Co Decagonal Quasicrystal" "Aperiodic'94" (World Scientific,Singapore). 351-355 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Edagawa: "Formation of Al-Ni-Co Decagonal Quasicrystals and Their Structure and Electrical Resistivity" "Advances in Physical Metallurgy" (Gordon & Breach). 96-103 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 竹内 伸: "「準結晶」という新秩序物質とその物性" PETROTECH. 17. 556-561 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Edagawa: "Order-Disorder Transition in an Al-Ni-Co Decagonal Quasicrystal" Philos.Mag.Lett.69. 227-234 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Edagawa: "Superlattice Structure in Al-Ni-Co Decagonal Quasicrystal" Mater.Sci.Forum. 150/151. 223-234 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Tei-Ohkawa: "Model Structures of Decagonal Quasicrystals and Comparison with Experiments" Mater.Sci.Forum. 150/151. 287-296 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Takeuchi: "Physical Properties of Quasicrystals -an Experimental Review-" Mater.Sci.Forum. 150/151. 35-52 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Edagawa: "Ordered and Disordered Phases in Al-Ni-Co Decagonal Quasicrystals" Phys.Rev.B. 50. 12413-12420 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2020-05-15  

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