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

1997 Fiscal Year Final Research Report Summary

Precise low temperature and high pressure apparatus using herium on an experimental basis

Research Project

Project/Area Number 07554056
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionThe University of Tokyo

Principal Investigator

MORI Nobuo  Institute for Solid State Physics, The University of Tokyo, Professor, 物性研究所, 教授 (40000848)

Co-Investigator(Kenkyū-buntansha) MURAYAMA Chizuko  Institute for Solid State Physics Research Assistant, 物性研究所, 教務職員 (80174316)
TAKESHITA Nao  Institute for Solid State Physics Research Associate, 物性研究所, 助手 (60292760)
ISHIMOTO Hidehiko  Institute for Solid State Physics Professor, 物性研究所, 教授 (60044773)
Project Period (FY) 1995 – 1997
KeywordsHigh pressure apparatus / Low temperature and high pressure / Low temperature, high pressure and magnetic field
Research Abstract

High pressure techniques at low temperatures have been proved to be very powerful tools in studies of recent topics related to the fundamental problems in strong correlated electron systems such as high-Tc superconductors, heavy fermion compounds and organic conductors. One of the main difficulties in high pressure techniques at low temperatures is to obtain uniform pressures at which reliable results are given, In, order to generate hydrostatic pressures at low temperatures we try to make a high pressure apparatus using herium on a experimental basis.
In the first step, in order to measure the superfluid fraction of the A phase of ^3He we made a high pressure equipment combined with a superconducting magnet using ^3He as a pressure transmitting medium. It works at high pressures up to 29 bar and at temperatures down to 34mK.Next, we tried to make an apparatus by which the unidirectional pressure can bbe applied on a fragile single crystal at low temperatures. Using this apparatus we made resistivity measurements of alpha -( BEDT-TTF )_2 KHg(SCN)_4 in the conducting plane under uniaxial stress below 1K.We used the cold bellows in which a pressure is variable by changing _4He gas at room temperature because of no solidification of liquid _4He up to 25 bar. The effective diameter of the bellows is about 70mm and the pressure amplification is about 100-200.
Similar bellows are adapted to high pressure generation up to 3OGPa using a diamond anvils combined with a dilution refrigerator and a superconducting magnet. This system is expected tobe a powerful tool in studies of recent and future topics related to the fundamental problems.

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] N.Mori 他: "A technique for precise magneto-transport measurements at low temperatures under pressure up to 8 GPa" Physica B in press.(1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Tang 他: "High Pressure Apparatus for in situ X-ray Diffraction and Electrical Resistance Measurement at Low Temperature" Rev.High Pressure Sci.Technol.Vol.7. 1496-14498 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Uwatoko 他: "High Pressure Apparatus for Magnetization Measurements," Rev.High Pressure Sci.Technol.Vol.7. 1508-1510 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Akimoto 他: "Pressure Dependence of the Superfluid Fraction in 3He-A," J.Low Temp.phys.101. 727-732 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hirayama 他: "On Superconductivity of α-(BEDT-TTF)2 KHg(SCN)4 under uniaxial stress below 1 K," Czech.J.Phys.,. 46 Suppl.813-814 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Obara 他: "Compettion of Multiple Spin Exchanges in Submonolayer Sold 3He," Phys.Rev.Lett.81. 2478-2481 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 毛利信男: "圧力発生技術" 丸善株式会社 (発行予定), (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Mori, T.Nakanishi, M.Ohashi, N.Takeshita, H.Goto, S.Yomo and Y.Okayama: "A technique for precise magneto-transport measurements at low temperatures under pressure up to 8 GPa" Physica B. (in press.).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Tang, T.Matsumoto, and N.Mori: "High Pressure Apparatus for in situ X-ray Diffraction and Electrical Resistance Measurement at Low Temperature" Rev.High Pressure Sci.Technol.Vol.7. 1496-14498 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Uwatoko, T.Hotta, E.Matsuoka, H.Mori, T.Ohki, J.L.Sarrao, J.D.Thompson, N.Mori and G.Oomi: "High Pressure Apparatus for Magnetization Measurements" Rev.High Pressure Sci.Technol.Vol.7. 1508-1510 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akimoto, T.Okuda and H.Ishimoto: "Pressure Dependence of the Superfluid Fraction in 3He-A" J.Low Temp.phys.101. 727-732 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hirayama, K.Manabe, H.Ishimoto, H.Ito and T.Ishiguro: "On Superconductivity of alpha- (BEDT-TTF) 2KHg (SCN) 4 under uniaxial stress below 1K" Czech.J.Phys.46-Suppl.813-814 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Karaki, Y.Koike, M.Kubota and H.Ishimoto: "Specific heat of beryllium-copper alloy at very low temperature" Cryogenics. 37. 171-172 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Akimoto, T.Okuda and H.Ishimoto: "Normal fluid fraction of superfluid 3He-Al in a high magnetic field" Phys.Rev.B55. 12635-12639 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Okuda, H.Ikegami, H.Akimoto and H.Ishimoto: "Direct observation of Andreev reflection at free surface of superfluid 3He" Phys.Rev.Lett.80. 2857-2860 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Manabe, H.Ishimoto, N.Koide, Y.Sasago and K.Uchinokura: "Antiferromagnetic long-range order in Cul-xZnxGeO3 with extremely low Zn concentration" Phys.Rev.B58. R575-578 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Obara, D.Ito and H.Ishimoto, H.Ikegami: "Competition of Multiple Spin Exchanges in Submonolayer Sold 3He" Phys.Rev.Lett.81. 2478-2481 (1998)

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

URL: 

Published: 1999-12-08  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi