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1999 Fiscal Year Final Research Report Summary

Vacancy Waves in a Quantum Solid ィイD13ィエD1He

Research Project

Project/Area Number 08240218
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionNagoya University

Principal Investigator

MAMIYA Takayoshi  Graduate School of Science, Nagoya University, Professor, 大学院・理学研究科, 教授 (20022600)

Co-Investigator(Kenkyū-buntansha) NAGAOKA Yousuke  Kansai University Professor, 工学部, 教授 (60022539)
MATSUSHITA Taku  Graduate School of Science, Nagoya University, Assistant Professor, 大学院・理学研究科, 助手 (00283458)
MIURA Yuichi  Graduate School of Science, Nagoya University, Associate Professor, 大学院・理学研究科, 助教授 (30175608)
Project Period (FY) 1996 – 1998
KeywordsQuantum Solid / Spin Polaron / Depressurized Solid / Tunnel Effect / Dislocation / Zero Point Vacancy Wave / Solid Helium / Amorphous Solid
Research Abstract

We aim at verifying that the vacancies move as vacancy waves because of tunneling of ィイD13ィエD1He atoms in solid ィイD13ィエD1He. We studied the vacancy waves in three categories. (1) specific heat, (2) motion of dislocation and (3) zero point vacancy wave. (1) A spin polaron is a region where ィイD13ィエD1He spins are aligned ferromagnetically around a vacancy. We have observed an excess specific heat over the specific heat due to the exchange interaction. We checked whether it arises from spin polarons due to vacancies by applying a strong magnetic field. The results show that the excess specific heat does not arise from spin polarons but the amorphous solid ィイD13ィエD1He layers on the substrate. (2) We studied the motion of dislocations in solid ィイD13ィエD1He by the torsional oscillator technique. We studied the temperature dependence of the critical strain amplitude where the dissipation starts to increase.
We have obtained clear evidence of the crossover from thermal to quantum tunneling of the dislocations through the Peierls potential. (3) We have been performing the experiment of pulsed NMR for depressurized solid in the fields of 8-15T. We aim at observing a decrease in TィイD21ィエD2 and increases in TィイD22ィエD2 and the diffusion constant due to the appearance of zero-point vacancy waves. So far, we have not yet confirmed the presence of zero-point vacancy waves.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Y.Miura et al.: "Molar-Volume Dependence of the Pressure in hcp Solid ^3He"J.Low Temp Phys. 116. 219-227 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mamiya et al.: "Low Frequency Susceptibility of High-Density bcc solid ^3He"J.Low Temp Phys. 115. 71-87 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kambara et al.: "Specific Heat due to Amorphous Surface in Solid ^3He"Eurohys. Lett. 46. 499-504 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Miura et al.: "Pinning of Dislocation Motion in bcc solid ^3He"J.Low Temp Phys. 113. 757-762 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kambara et al.: "Specific Heat Anomaly in bcc Solid ^3He"J.Low Temp Phys. 113. 727-734 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Miura et al.: "Dislocation Motion in bcc Solid ^3He"J.Low Temp Phys. 110. 115-119 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Miura et al.: "Molar-Volume Dependence of the Pressure in hcp Solid ィイD13ィエD1He"J. Low Temp. Phys.. 116. 219-227 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Mamiya et al.: "Low Frequency Susceptibility of High-Density bcc Solid ィイD13ィエD1He"J. Low Temp. Phys.. 115. 71-87 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kambara et al.: "Specific Heat due to Amorphous Surface in Solid ィイD13ィエD1He"Europhys. Lett.. 46. 499-504 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Miura et al.: "Pinning of Dislocation Motion in bcc Solid ィイD13ィエD1He"J. Low Temp. Phys.. 113. 757-762 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kambara et al.: "Specific Heat Anomaly in bcc Solid ィイD13ィエD1He"J. Low Temp. Phys.. 113. 727-734 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Miura et al.: "Dislocation Motion in bcc Solid ィイD13ィエD1He"J. Low Temp. Phys.. 110. 115-119 (1998)

    • 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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