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Low-Energy Magnetic Excitation of Kondo Semiconductor

Research Project

Project/Area Number 07454076
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTOKYO METROPOLITAN UNIVERSITY (1996)
The University of Tokyo (1995)

Principal Investigator

KADOWAKI Hiroaki  Tokyo Metropolitan University, Department of Physics, Associate Professor, 大学院理学研究科, 助教授 (70194876)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1996: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1995: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsKondo semiconductor / magnetic excitation / energy gap / neutron scattering / CeNiSn / 重い電子系
Research Abstract

The energy gap in the magnetic excitation of the Kondo semiconductor CeNiSn was shown by NMR measurements. Complementary and more direct evidence of the energy gap can be obtained by neutron scattering, which is the purpose of the present investigation. However, the magnetic signal is very difficult to observe, because it is very weak and hidden in larger noise. To resolve this problem we planned to increase the intensity of a cold-guide triple-axis spectrometer by preparing a horizontally focusing analyzer which utilizes a larger solid angle. The geometry of the analyzer was optimized using a computer simulation. Test experiments of the analyzer showed that it gives a large gain factor of 14 in intensity compared to the previous collimator condition with the same energy resolution. Reduction of background is also important for weak signals, and this was achieved by inserting a shield between the analyzer and the detector. By these efforts of the focusing analyzer, the performance of the triple-axis spectrometer was substantially improved in terms of both intensity and noise. Using this instrument we measured low-energy magnetic excitation on a polycrystal-like sample which is made of an isotope ^<58>Ni. It has been becoming clear that the magnetic gap really exists in an energy range below 1.5 meV.Although the energy scale of 1.5 meV is larger than the value expected from specific heat and NMR by a factor two or three, the spectral shape and the temperature dependence is definitely consistent with the NMR results. We conclude that the gap of the magnetic excitation is proved by the present work.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Taku J.Sato 等: "Neutron scattering study of antiferromagnetic correlations in the Kondo Semiconductor CeNiSu" J.Phys.Condens.Matter. 7. 8009-8026 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Taku J.Sato 等: "The effect of Co doping on antiferromagnetic correlations in the Kondo semi-metal CeNiSn" J.Phys.Condens.Matter. 8. 7127-7138 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Taku J.Sato 等: "The effect of pressure on antiferromagnetic correlations in the Kondo semimetal CeNiSn" J.Phys.Condens.Matter. 8. 8183-8189 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Raymond 等: "An inelastic neutron scattering study of the Kondo semiconductor CeNiSn in high magnetic field" J.Phys.Condens.Matter. 9. 1599-1608 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kadowaki 等: "Pressure effect on magnetic excitation in the Kondo semimetal CeNiSn" Physica B. 230-232. 664-666 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kadowaki: "Representation Analysis and Spin-Slip Model of the Incommensurate Structure of the Kondo Antiferromagnets CePdSn and CePtSn" J.Phys.Soc.Jpn.69・7. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Taku J.Sato, Hiroaki Kadowaki, Hideki Yoshizawa, Toshikazu Ekino, Toshiro Takabatake, Hironobu Fujii, L.P.Regnault and Yosikazu Isikawa: "Neutron scattering study of antiferromagnetic correlations in the Kondo semiconductor CeNiSn" J.Phys.Condens.Matter. 7. 8009-8026 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Taku J.Sato, Hiroaki Kadowaki, Hideki Yoshizawa, Toshiro Takabatake, Hironobu Fujii, and Yosikazu Isikawa: "The effect of Co doping on antiferromagnetic correlations in the Kondo semimetal CeNiSn" J.Phys.Condens.Matter. 8. 7127-7138 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Taku J Sato, Hiroaki Kadowaki, Toshiro Takabatake, Hironobu Fujii and Yosikazu Isikawa: "The effect of high pressure on antiferromagnetic correlations in the Kondo semimetal CeNiSn" J.Phys.Condens.Matter. 8. 8183-8189 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Raymond, L.P.Regnault, T.J.Sato, H.Kadowaki, N.Pyka, G.Nakamoto, T.Takabatake, H.Fujii, Y.Isikawa, G.Lapertot and J.Flouquet: "An inelastic neutron scattering study of the Kondo semiconductor CeNiSn in high magnetic field" J.Phys.Condens.Matter. 9. 1599-1608 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kadowaki, T.J.Sato, G.Nakamoto, T.Takabatake, H.Fujii and Y.Isikawa: "Pressure effect on magnetic excitation in the Kondo semimetal CeNiSn" Physica B. 230-232. 664-666 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Kadowaki: "Representation Analysis and Spin-Slip Model of the Incommensurate Structure of the Kondo Antiferromagnets CePdSn and CePtSn" J.Phys.Soc.Jpn.67 No.9 (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.J.Sato et al.: "The effect of Co doping on antiferro magnetic correlations in the Kondo semi-metal CeNiSn" Journal of Physics : Condensed Matter. 8. 7127-7139 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.J.Sato et al.: "The effect of high pressure on antiferromagnetic correlations in the Kondo semimetal CeNiSn" Journal of Physics : Condensed Matter. 8. 8183-8189 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Raymond et al.: "Inelastic neutron scattering study of the Kondo semicorductor CeNiSn in high magnetic field" Journal of Physics : Condensed Matter. 9. 1599-1608 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Kadowaki et al.: "Pressure effect on magnetic excitation in the Kondo semimetal CeNiSn" Physica B. (発表予定).

    • Related Report
      1996 Annual Research Report
  • [Publications] T J Sato: "Neutron scattering study of antiferromagnetic correlations in the Kondo semiconductor CeNiSn" J Phys : Condens.Matter. 7. 8009-8026 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2020-05-15  

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