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1999 Fiscal Year Final Research Report Summary

Motion of dislocations and surface steps with quantum dissipation

Research Project

Project/Area Number 08240104
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionUniversity of Tokyo

Principal Investigator

SUZUKI Takayoshi  Univ. of Tokyo, Inst. Indust. Sci., Prof., 生産技術研究所, 教授 (70013208)

Co-Investigator(Kenkyū-buntansha) MIZUSAKI Takao  Kyoto Univ., Fac. of Sci., Prof., 大学院・理学研究科, 教授 (20025448)
KOIZUMI Hirokazu  Meiji Univ., Fac. of Engin., Prof., 理工学部, 教授 (60126050)
TAKEUCHI Shin  Tokyo Sci. Univ., Fac. of Sci., Prof., 基礎工学部, 教授 (60013512)
UAHA Makio  Nagoya Univ., Assoc., Fac. Sci., Prof., 大学院・理学研究科, 助教授 (30183213)
Project Period (FY) 1996 – 1998
Keywordsquantum tunneling / dislocation / surface step / solid helium / plastic deformation / MRI technique
Research Abstract

Some phenomena in many body system, such as motion of crystal dislocations and crystal growth of solid helium, can be reasonably described by the picture of a line. The purpose of this project is to investigate the macroscopic quantum tunneling for such processes. The group I (Suzuki, Takeuchi and Koizumi) constructed an apparatus for the deformation tests of solids in liquid ィイD13ィエD1He. Using a superconducting magnet one can measure the changes in flow stress by the super-normal transition. Experiments were performed on bcc metals and ionic crystals in which dislocation motion occures by the Peierls mechanism. Particularly the results for tantalum were analysed according to the theory published already by us, and the effective mass of a dislocation and the friction due to electrons are successfully estimated. The group II (Mizusaki and Uaha) investigated crystal growth of solid helium and obtained following results : 1) Ultra-sound velocity measurement of nuclear-ordered U2D2 solid ィイD13ィエD1He with monodomain crystal along the melting curve : The sound velocity δv/v changes as TィイD14ィエD1 below the nuclear-ordered temperature TィイD2NィエD2, 0.07% jump at TィイD2NィエD2 and takes a maximum at 3mK and decreases as T goes up. 2) Development of the MRI technique applicable at ultra-low temperatures and its application to visualization of the shape of phase separated ィイD13ィエD1He-ィイD14ィエD1He mixture. From the shape of the boundery under the gravity, we obtained the surface traction σ and the contact angle θ near the tri-critical point TィイD2tィエD2. 3) We proposed the new mechanism for solid nucleation caused by the quantum tunneling of pinning mechanism of pre-existed seed crystal on the sample wall.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Hashimoto,S.Katakura,S.Takeuchi,T.Suzuki: "Apparatus for deformation of solids in liquid ^3He"Rev. Sci. Instrum. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takeuchi,T.Suzuki,H.Koizumi: "Interpretation of Enhanced Plasticity in Superconducting Tantalum in Terms of Enhanced Quantum Tunneling of Dislocation"J. Phys. Soc. Japan. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Suzuki,M.Yamaguchi,Y.Sasaki,T.Mizusaki: "Sound Velocity Measureement of Nuclear-Ordered U2D2 Solid ^3He along the Melting Curve"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ueno,M.Fujisawa,K.Fukuda,T.sasaki,T.mizusaki: "Visualization bof Phase-Separated Boundary in liquid ^3He-^4He"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Ishikawa,R.Ishiguro,T.Mizusaki,R.E.Packerd: "NMR Measurements of Superfluid 3He-A in Cylindrical Cell under Rotation"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Balibar,T.Mizusaki,Y.Sasaki: "Heterogeneous nucleation : solid ^4He and superfluid ^3He-B"(in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto, S. Katakura, S. Takeuchi and T.Suzuki: "Apparatus for deformation of solids in liquid ィイD13ィエD1He"Rev. Sci. Instrum.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Takeuchi, T. Suzuki and H. Koizumi: "Interpretation of Enhanced Plasticity in Super-conducting Tantalum in Terms of Enhanced Quantum Tunneling of Dislocation"J. Phys. Soc. Japan. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Suzuki, M. Yamaguchi, Y. Sasaki and T. Mizusaki: "Sound Velocity Measurement of Nuclear-ordered U2D2 Solid ィイD13ィエD1He along the Melting Curve"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Ueno, M. Fujiwara, K. Fukuda, T. Sasaki adn T. Mizusaki: "Visualization of Phase-separated Boundery in liquid ィイD13ィエD1He-ィイD14ィエD1He"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O. Ishikawa, R. Ishiguro, T. Mizusaki and R.E.Packerd: "NMR Measurements of Superfluid ィイD13ィエD1He-A in Cylindrical Cell"Physica B. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Baliber, T. Mizusaki and Y. Sasaki: "Heterogeneous nucleation : solid ィイD14ィエD1He and superfluid ィイD13ィエD1He-B"Physica B. (in press). (2000)

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

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Published: 2001-10-23  

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