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1993 Fiscal Year Final Research Report Summary

Electrical Conductivity in Quasicrystals and their Crystal Approximants

Research Project

Project/Area Number 04452036
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionThe University of Tokyo

Principal Investigator

TAKEUCHI Shin  The University of Tokyo, Inst.Solid State Physics, Professor, 物性研究所, 教授 (60013512)

Co-Investigator(Kenkyū-buntansha) SUZUKI Kunio  The University of Tokyo, Inst.Solid State Physics, Research Associate, 物性研究所, 助手 (50107439)
EDAGAWA Keiichi  The University of Tokyo, Inst.Solid State Physics, Research Associate, 物性研究所, 助手 (20223654)
KIMURA Kaoru  The University of Tokyo, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30169924)
Project Period (FY) 1992 – 1993
KeywordsQuasicrystal / Crystal approximant / Electrical conductivity / Electron localization / Hopping conduction
Research Abstract

1. Main results obtained for high quality samples are as follows :
(1) In A1-Pd-Mn icosahedral phase, electrical resistivity increases almost linearly with deceasing temperature and shows a maximum at few tens of Kelvin and then decreases in low Mn-concentration alloys. The specific resistivity at helium temperature is generally quite high and varies from 10^3 to 10^4 mu OMEGA cm depending on the alloy composition. The temperature dependence of the resistivity, as well as the magnetoresistance effect, can be interpreted by the weak-localization theory that takes into account the spin-orbit interaction.
(2) Also in Al-Pd-Re icosahedral phase, the resistivity is extremely high and varies sensitively with the composition. In some Al_<70>Pd_<20>Re_<10> alloys, the resistivity value reaches as high as 1O MEGA cm at helium temperature, which is the highest value ever reported for quasicrystals. Temperature and magnetic field dependences of the resistivity are interpreted by the weak-localization theory except the samples with the highest resistivity which show hoping-like conduction.
(3) In Al-Cu-Ru and Al-Cu-Fe icosahedral phases, the electrical conductivity varies as T^<1/2> below a few tens of Kelvin due to the electron-electron interaction effect and as T linear above the temperature due to the weak-localization effect. Hall coefficient measurements have suggested the temperature variation of the carrier density.
2. From the experimental results so far obtained, we get the following picture : in both high-quality quasicrystals and their high-order crystal approximants, a deep pseudo-gap is always forms at the Fermi-level due to the Fermi-surface quasi-Brillouin zone boundary interaction, and the electrons near the Fermi-level have a stronger tendency to localize as the pseudo-gap deepens ; these circumstances produce characteristic behavior of electrical resistivity in quasicrystals.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] K.Edagawa: "Icosahedral and Approximant Phases in Mg-Ga-Al-Zn Alloy and their Electrical Resistivities" Phil.Mag.B. 65. 1011-1023 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 竹内 伸: "準結晶の物性に関する研究" 学術研究の動向. 45. 866-871 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Akiyama: "Electrical Resistivity of Al-Pd-Mn Icosahedral Quasicrystals" J.Phys.Soc.Jpn.62. 639-646 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takeuchi: "Electrical Resistivity of Single-Grained Quasicrystals" J.Non-cryst.Solids. 153/154. 353-356 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Akiyama: "Toward Insulating Quasicrystalline Alloy in Al-Pd-Re Icosahedral Phase" Jpn.J.Appl.Phys.32. L1003-L1004 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 木村 薫: "準結晶の不思議な物性" パリティー. 8(10). 21-30 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takeuchi: "Physical Properties of Quasicrystals-An Experimental Review-" “Quasicrystals and Imperfectly Ordered Crystals". (Trans Tech Pub)(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Honda: "Formation of Al-Pd-Mn Icosahedral Quasicrystals and their Electrical Properties" “Quasicrystals and Imperfectly Ordered Crystals". (Trans Tech Pub)(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Tamura: "Electrical Conductivity and Hall Effect of Al-Cu-Ru and Al-Cu-Fe Quasicrystals" Mater.Sci.Eng.A. (発表予定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 竹内 伸: "準結晶" 産業図書株式会社, 138 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Edagawa, N.Naito and S.Takeuchi: "Icosahedral and Approximant Phases in Mg-Ga-Al-Zn Alloy and their Electrical Resistivities" Phil.Mag.B.65-5. 1011-1023 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeuchi: "On Physical Properties of Quasicrystals (in Japanese)" Gakujutsu-Kenkyu-no-Doukou. 45-9. 866-871 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akiyama, T.Hashimoto, T.Shibuya, K.Edagawa and S.Takeuchi: "Electrical Resistivity of Al-Pd-Mn Icosahedral Quasicrystals" J.Phys.Soc.Jpn.62-2. 639-646 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeuchi, H.Akiyama, N.Naito, T.Shibuya, T.Hashimoto, K.Edagawa and K.Kimura: "Electrical Resistivity of Simple-Grained Quasicrystals" J.Non-Cryst.Solids. 153/154. 353-356 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akiyama, Y.Honda, T.Hashimoto, K.Edagawa and S.Takeuchi: "Toward Insulating Quasicrystalline Alloy in Al-Pd-Re Icosahedral Phase" Jpn.J.Appl.Phys.32-7B. L1003-L1004 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kimura: "Strange Properties in Quasicrystals (in Japanese)" Parity. 8-10. 21-30 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeuchi: "Physical Properties of Quasicrystals -All Experimental Review-" "Quasicrystals and Imperfectly Ordered Crystals" Trans Tech.Pub Ltd.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Honda, K.Edagawa, A.Yoshioka, H.Akiyama, T.Hashimoto and S.Takeuchi: "Formation of Al-Pd-Mn Icosahedral Quasicrystals and their Electrical Properties" "Quasicrystals and Imperfectly Ordered Crystals" Trans Tech.Pub.Ltd.(in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Tamura, A.Waseda, K.Kimura and H.Ino: "Electrical Conductivity and Hall Effect of Al-Cu-Ru and Al-Cu-Fe Quasicrystals" Mater.Sic.Eng.A. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takeuchi: Quasicrystals (in Japanese). Sangyoutosho, Pub.Co.Ltd., 138

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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