• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1999 Fiscal Year Final Research Report Summary

Quantum diffusion and Bloch waves of atoms in solids

Research Project

Project/Area Number 08240106
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionChuo University

Principal Investigator

FUKAI Yu  Department of Physics, Chuo University Professor, 理工学部, 教授 (80055136)

Co-Investigator(Kenkyū-buntansha) KADONO Ryosuke  Institute of Materials Structure Science Professor, 教授 (10194870)
YAMADA Kousaku  Department of Physics, Kyoto University Professor, 理学研究科, 教授 (90013515)
SUGIMOTO Hidehiko  Department of Physics, Chuo University Professor, 理工学部, 教授 (00187668)
HIGEMOTO Wataru  Inst. of Physical and Chemical Research Res. staff, ミュオン科学研究室, 研究員
Project Period (FY) 1996 – 1998
KeywordsQuantum diffusion / Hydrogen in metals / muon / muonium / NMR / μSR
Research Abstract

Fukai aimed at developing a new arena of quantum diffusion in solids, and decided to focus on hydrogen atoms trapped by vacancies in metals. He started by doing systematic experiments on the superabundant vacancy formation, i.e. the formation of a large number of vacancy-hydrogen clusters in metals, and tried to determine their thermal-equilibrium concentrations, their sources and kinetics of formation, their dependence on metal species, etc. By these systematic investigations and theoretical developments (also made by Fukai), the phenomenon of superabundant vacancy formation was clarified adequately, and has become predictable and controllable. Thus he selected the Nb-H system as the most suitable one for the present purpose, and performed NMR measurements down to liq.He temperatures. A proton signal motionally narrowed below 20 K was observed and was attributed to a cage motion of hydrogen atoms trapped by vacancies. Possible quantum states and tunnelling motion of these protons are still under investigation.
Kadono consistently pursued a manifestation of the de Broglie wave nature of atoms in solids by μSR experiments at extremely low temperatures. He built a cryostat operative down to several mK, and measured μSR signals in a KCl crystal as a function of temperature and magnetic field. Novel features observed at the lowest temperature ( < 10 mK ) analyzed in terms of Kondo's theory (also developed during the same period) revealed unambiguously the Bloch character of muonium waves propergating in a KCl lattice. This is the first observation of such a wave nature of atoms in solids.
In this way, the two original aims of this research project have been accomplished to a large extent.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 深井有、黒川善文、平岡寛勝: "金属-水素合金における原子空孔の多量生成とその効果"日本金属学会誌. 61・8. 663-670 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Hayashi,Y.Kurokawa,Y.Fukai: "Hydrogen-induced enhancement of interdiffusion in Cu-Ni, diffusion couples"Physical Review Letters. 80・25. 5588-5590 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sugimoto,S.Ikeda: "Proton transfer in hydrogen-bonded cristalline KH_2P0_4"Journal of Physics : Condensed Matter. 8・5. 603-618 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Kadono,R.F.Kiefl,W.A.McFarlane,S.Dunsinger: "Diffusion and localization of muonium in Na-doped KC1"Physical Review. B53・6. 3177-3182 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Kasono: "Quantum diffusion of muon and muonium in solids"Applied Magnetic Resonance. 13. 37-54 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Kadono,W.Higemoto,K.Nagamine,F.L.Pratt: "An atom in the Bloch state"Rhysical Review Letters. 83・5. 987-990 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 深井有、田中一英、内田裕久: "水素と金属"内田老鶴圃. 254 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Fukai, Y. Kurokawa, H. Hiraoka: "Superabundant vacancy formation and its consequences in metal-hydrogen alloys"Journal of Japan Institute of Metals. 61. 663-670 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E. Hayashi, Y. Kurokawa and Y. Fukai: "Hydrogen-induced enhancement of interdiffusion in Cu-Ni diffusion couples"Physical Review Letters. 80. 5588-5590 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Sugimoto, S. Ikeda: "Proton transfer in hydrogen-bonded cristalline KHィイD22ィエD2POィイD24ィエD2"Journal of Physics : Condensed Matter. 8. 603-618 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kadono, R.F.Kiefl, W.A.McFarlane and S.R.Dunsiger: "Diffusion and localization of muonium in Na-doped KCl"Physical Review. B53. 3177-3182 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kadono: "Quantum diffusion of muon and muonium in solids"Applied Magnetic Resonance. 13. 37-54 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kadono, W. Higemoto, K. Nagamine and F.L.Pratt: "An atom in the Bloch state"Physical Review Letters. 83. 987-990 (1999)

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

URL: 

Published: 2001-10-23  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi