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Research on Development of Thermometers for Cryogenic Temperature in Magnetic fields

Research Project

Project/Area Number 02640244
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionIwate University

Principal Investigator

YOSHIZAWA Masahito  Iwate University, Engineering, Assoc. Prof., 工学部, 助教授 (30220619)

Co-Investigator(Kenkyū-buntansha) SHIGEMATSU Koji  Iwate University, Education, Assoc. Prof., 教育学部, 助教授 (10221293)
IKEDA Koki  Iwate University, Engineering, Prof., 工学部, 教授 (40100979)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1990: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsThin film / Anderson localization / Thermometer / Low temperature / High magnetic field / Electrical resistivity / Acoustic properties / 電波物性
Research Abstract

Zr-N sputtered films, which have been drawn attention as the best candidate for the thermometers at cryogenic temperature with magnetic fields, have been investigated by electrical and acoustical measurements. The results obtained in this research project are summarized as below.
1. Classification of Zr-N films : Zr-N films fabricated with various sputtering conditions ; substrate temperature and nitrogen partial pressure, can be classified and divided into two groups by the resistance ratio. between room and helium temperatures.
2. Origin of small magnetoresistance : Magnetoresistance(MR)of Zr-N films is investigated by the measurements in the field up to 30T. It is found that MR of Zr-N consists of various contributions from quantum interference, spin-orbit and interaction effects. The small MR in weak field arises from accidental cancellation of these contributions. The possibility of occurrence of ferromagnetism was also suggested.
3. Universal behavior in temperature dependence of electrical conductivity : We present attempts for finding the universal function which describes T dependence of conductivity. The conductivity sigma is described as sigma=sigma_0+AAOT for major parts of samples at high temperatures, and as sigma=sigma_0+A(T-T_0)^<gamma> at low temperatures. The relations among gamma, A, etc. are found.
4. Discovery of novel elastic anomalies : The velocity of surface acoustic wave shows remarkable anomalies as a function of temperature. The strongly localized sample with high resistance ratio shows a broad minimum at above 300 K and a softening toward low temperature. The weakly localized sample shows sole a broad minimum at 15 K. These elastic anomalies and the relation to the localization are discussed based on two-level-system.
From the series of investigations, the physical properties of Zr-N films has been made clear. These results would lead the successful development of then-nometers for the use at cryogenic temperature in magnetic field.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] M.Yoshizawa: "Temperature and Magnetic Field Dependence of Resistivity of Zr-N Sputtered Films" Physica B. 165,166. 293-294 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉澤 正人: "ZrN系薄膜温度素子の磁気抵抗に関する研究" 東北大学金属材料研究所超伝導材料開発施設平成元年度年次報告. 262-265 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉澤 正人: "ZrN系薄膜温度素子の磁気抵抗に関する研究" 東北大学金属材料研究所超伝導材料開発施設平成2年度年次報告. 320-324 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Yoshizawa: "Electrical Resistivity and High Field Magnetoresistance of Zr-N Film Thermometers" Jpn.J.Appl.Phys.(1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H.Sugawara: "Simple Power-law Behavior in Temperature Dependence of Electrical Conductivity of Zr-N Film Thermometers" Jpn.J.Appl.Phys.(1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Yoshizawa: "Novel Elastic Softening in Zr-N films"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Yoshizawa: "Temperature and Magnetic Field Dependence of Resistivity of Zr-N Sputtered Films" Physica B. 165&166. 293-294 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Yoshizawa: "Magnetoresistance of Zr-N thin film thermoelements" Annual Report of High Field Laboratory for Superconducting Materials. 262-265 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Yoshizawa: "Magnetoresistance of Zr-N thin film thermoelements" Annual Report of High Field Laboratory for Superconducting Materials. 320-324 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Yoshizawa: "electrical resistivity and High Field Magnetoresistance of Zr-N Film Thermometers" Jpn. J. Appl. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Sugawara: "Simple Power-law Behavior in Temperature Dependence of Electrical Conductivity of Zr-N Film Thermometers" Jpn. J. Appl. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Yoshizawa: "Novel elastic Softening in Zr-N films"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉澤 正人: "ZrN系薄膜温度素子の磁気抵抗に関する研究" 東北大学金属材料研究所超伝導材料開発施設平成2年度年次報告. 320-324 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Yoshizawa: "Novel Elasitic Softening in ZrーN films"

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Yoshizawa: "Temperature and magnetic field dependence of resistance in ZrーN sputtered films" Physica B. 165&166. 293-294 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 吉澤 正人: "ZrN系薄膜温度素子の磁気抵抗に関する研究" 東北大学金属材料研究所 超伝導材料開発施設・平成元年度年次報告. 262-265 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 吉澤 正人: "磁場に影響されない温度センサの開発" 低温工学協会・材料部会シンポジウム. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Yoshizawa: "Anderson localization in ZrーN sputtered films" Physical Review B. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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