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GIANT SPIN FLUCTUATIONS IN LAVES PHASE YMn_2

Research Project

Project/Area Number 62540238
Research Category

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

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

Principal Investigator

SHIGA Masayuki  KYOTO UNIVERSITY, DEPARTMENT OF METAL SCIENCE AND TECHNOLOGY, PROFESSOR, 工学部, 教授 (30026025)

Co-Investigator(Kenkyū-buntansha) WADA Hirofumi  KYOTO UNIVERSITY, DEPARTMENT OF METAL SCIENCE AND TECHNOLOGY, INSTRUCTOR, 工学部, 助手 (80191831)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1989: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsLaves phase / YMn_2 / Spin fluctuations / Electronic specific heat / Electric resistivity / Heavy Fermion / Spin glasses / Frustration / ラーベス相 / スピンの揺ぎ / 近藤効果 / YMn2 / 重いフェルミ粒子系 / 中性子散乱
Research Abstract

By substituting Sc for Y, an itinerant antiferromagnt YMn_2 becomes a Pauli paramagnet. We have shown by thermal expansion analysis and neutron scattering, experiments that giant spin fluctuations are thermally excited. In this research, we have measured the low temperature specific heart, electric resistivity and have shown that this system has characteristics of heavy Fermion systems although it contains neither 4f nor 5f element. In addition, we have investigated the magnetism and other properties of Y(Sc)(Mn_<1-x>Al_x)_2 system and have shown that anomalous properties of the present system may originate in frustrative magnetic interactions. Main results for each year are given below:
1987
(1) The low temperature specific heat of Y_<0.95>Sc_<0.05>Mn_2 was measured. It has been revealed that the electronic specific heat coefficient of this material is the largest in 3d metallic systems as gamma=145mJ/mol・K^2. (2) The temperature dependence of electrical resistivity was measured for Y_<0.95>Sc_<0.05>Mn_2 from 4.2K to 300K. We have shown that the coefficient of T^2 term is very large as A=0.25mu OMEGA cm/K^2,which is comparable to that of heavy Fermion systems.
1988
(1) The system for low temperature specific heat measurements was automated by using a micro-computer. Using this system, the low temperature specific heats of Y_<1-x>Sc_xMn_2 were measured and the gamma value was obtained as a function of concentration. The system for low temperature specific heat measurements was automated by using (2) The electric resistivity of Y_<0.95>Sc_<0.05>(Mn_<1-x>Al_x)_2 was measured as a function of temperature and revealed that the system transfers from a heavy Fermion like to a local moment system.
1989
Magnetic susceptibility and low temperature specific heat of Y_<0.95>Sc_<0.05>(Mn_<1-x>Al_x)_2 system were measured. We explained the characteristic properties of these systems as a result of magnetic frustrations.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] 中村裕之: "EFFECT OF CHEMICAL PRESSURE ON THE MAGNETISM OF YMn_2." J.Phys.F. 18. 981-991 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 志賀正幸: "MAGNETISM AND SPIN FLUCTUATIONS OF LAVES PHASE MANGANESE COMPOUNDS." Physica B. 149. 293-305 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 志賀正幸: "GIANT SPIN FLUCTUATION IN Y_<0.97>Sc_<0.03>Mn_2." J.Phys.Soc.Japan. 57-9. 3141-3145 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 志賀正幸: "GIANT SPIN FLUCTUATION IN YMn_2 AND RELATED COMPOUNDS." J.de Phys.49. C8241-246 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中村裕之: "NUCLEAR MAGNETIC RERAXATION OF Y_<1-X>Sc_XMn_2." J.de Phys.49. C8257-258 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 和田裕文: "LOW TEMPERATURE SPECIFIC HEAT OF NEARLY FERRO-AND ANTIFERRO-MAGNETIC COMPOUNDS." Physica B. 161. 197-202 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Shiga, H.Wada, H.Nakamura, K.Yoshimura and Y.Nakamura: "Characteristics Spin Fluctuations in Y(Mn_<1-x>Al_x)_2" J.Phys. F Vol.17 No.8 pp. 1781-1793, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Wada, H.Nakamura, E.Fukami, K.Yoshimura, M.Shiga and Y.Nakamura: "Spin Fluctuations of Y(Mn_<1-x>Al_x)_2 and Y_<1-x>Sc_xMn_2" J. Magn. Mag. Mater. Vol.70 pp. 17-19, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Wada, H.Nakamura, K.Yoshimura and Y.Nakamura: "Stability of Mn Moments and Spin Fluctuations in RMn_2 (R:Rare Earth)" J. Magn. Mag. Mater. Vol.70 pp. 134-136, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Yoshimura, H.Nakamura, M.Takigawa, H.Yasuoka, M.Shiga and Y.Nakamura: "NMR Study of Nearly Itinerant Antiferromagnetic Y_<1-x>Sc_xMn_2" J. Magn. Mag. Mater. Vol.70 pp. 142-144, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Kamimura, J.Sakurai, Y.Komura, H.Nakamura, M.Shiga and Y.Nakamura: "Thermoelectric Power of Y(Mn_<1-x>Al_x)_2" J. Magn. Mag. Mater. Vol.70 pp. 145-146, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Nakamura, H.Wada, K.Yoshimura, M.Shiga, Y.Nakamura, J.Sakurai and Y.Komura: "Effect of Chemical Pressure on the Magnetism of YMn_2" J. Phys. F Vol.18 pp. 981-991, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Shiga: "Magnetism and Spin Fluctuations of Laves Phase Manganese Compounds" Physica B Vol.149 pp. 293-305, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Shiga, H.Wada and Y.Nakamura, J.Deportes, B.Ouladdiaf and K.R.A.Ziebeck: "Giant Spin Fluctuations in Y_<0.97>Sc_<0.03>Mn_2" J. Phys. Soc. Japan Vol.57 No.9 pp. 3141-3145, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Shiga, H.Wada, Y.Nakamura, J.Deportes and K.R.A.Ziebeck: "Ginat Spin Fluctuations in YMn_2 and Related Compounds" J.de Phys. Vol.49 pp. C8 241-246, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Nakamura, Y.Kitaoka, K.Yoshimura, H.Kohori, K.Asayama, M.Shiga and Y.Nakamura: "Nuclear Magnetic Relaxation of Y_<1-x>Sc_xMn_2" J.de Phys. Vol.49 pp. C8 257-258, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Wada, M.Shiga and Y.Nakamura: "Low Temperature Specific Heat of Nearly Ferro- and Antiferro-magnetic Compounds" Physica B Vol.161 pp. 197-202, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 志賀正幸: "GIANT SPIN FLUCTUATIONS IN YMn_2 AND RELATED COMPOUNDS" JOURNAL DE PHYSIQUE. 49. C8241-246 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中村裕之: "NUCLEAR MAGNETIC RELAXATION OF Y_<1-x>Sc_xMN_2" JOURNAL DE PHYSIQUE. 49. C8257-258 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 和田裕文: "LOW TEMPERATURE SPECIFIC HEAT OF NEARLY FERROーAND ANTIFERROMAGNETIC COMPOUNDS" Physica B. 161. 197-202 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 志賀正幸: "SPIN LIQUID TO SPIN GLASS TRANSITION IN Y(Sc)Mn_2 SYSTEM CAUSED BY NONMAGNETIC IMPURITY" J.Mag.Mag.Meters.

    • Related Report
      1989 Annual Research Report
  • [Publications] 志賀正幸: J.Phys.F. 17. 1781-1793 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] 和田裕文: J.Magn.Magn.MMater. 70. 17-19 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] 中村裕之: J.Phys.F. 18. 981-991 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 志賀正幸: Physica B. 149. 293-305 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 志賀正幸: J.Phys.Soc.Japan. 57. 3141-3145 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 志賀正幸: J.de Phys.

    • Related Report
      1988 Annual Research Report
  • [Publications] 志賀正幸: J. Phys. F. 17. 1781-1793 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 和田裕文: J. Magn. Magn. Mater.70. 17-19 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 和田裕文: J. Magn. Magn. Mater.70. 134-136 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 上村裕彦: J. Magn. Magn. Mater.70. 145-146 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 中村裕之: J. Phys. F. 12. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] 志賀正幸: Physica B. (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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