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1990 Fiscal Year Final Research Report Summary

Study of Nuclear Spin Ordering

Research Project

Project/Area Number 01540259
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionKanazawa University (1990)
Tohoku University (1989)

Principal Investigator

SUZUKI Haruhiko  Kanazawa Univ. Faculty of Science : Asociate Professor, 理学部, 助教授 (50004370)

Co-Investigator(Kenkyū-buntansha) SAKATSUME Shin'ichi  Tohoku Univ. Cryogenic Senter : Research Asociate, 助手 (20005896)
Project Period (FY) 1989 – 1990
KeywordsNuclear Magnetism / Nuclear Cooling / Adiabatic Demagneti Zed Cooling / Ultra Low Temperature / Spin Glass
Research Abstract

Among a large number of pure metals, only in Cu the nuclear spins have been cooled down below their spontaneous ordering temperature. Though great efforts have been devoted to achieve the nuclear spin order, the clear evidence of oraering has not yet been observed in other metals so far. We are interested in the nuclear spin ordering in Sc metal which is known as the highly exchange enhanced Pauli paramagnetic metals. In order to achieve the nuclear spin ordering in Sc metal, we constructed two stage demagnetiziaton cryostat. Before doing the two stage demagnetized cooling experiment, we measured a temperature dependance of the magnetic susceptibility of Sc metal above 0.25 mk by the one stage demagnetized cooling. Result can be understood by the spin glass phenomenon of iron impurity in Sc metal. Then we performed the two stage semagnetized experiment. By a first stage demagntization cooling, we cooled down the Sc metal to 0.25 mk. From this temperature and 7 T initial magnetic field, nuclear spins in Sc metal was cooled down below 50 nk by the demagnetization. The warming up behaviour of the ac magnetic susceptibility has been measured following demagnetization cooling of Sc specimen itself. Amtiferromagnetic-like maximum of the magnetic susceptibility was observed. Nuclear spins stayed in the ordered state about 45 minutes. This is the second observation of the nuclear spin ordering in metal elements. But we have not yet deter mined the ordering temperature T_N. We are going to make further experiment to clear the properties of the nuclear magnetism of Sc metal.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 増田 由美子: "Hyperfine Enhanced Nuclear Magnetism of Cs_2NaHoCl_6" J.Low Temp.Phys.75. 159-186 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 治彦: "Antiferromagnetic Resonance of Hyperfine Enhanced Nuclear Antiferrmagnet HoVO_4" Proc.of Symposium on Quantum Fluids and Solidsー1989,Ed.by Ihas & Takano. 328-329 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 治彦: "Experiment on Nuclear Spin Ordering in Sc Metal" Physica. B165 & 166. 795-796 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木 治彦: "Antiferromagnetic Resornance of Hyperfine Enhanced Nuclear Spins of Ho in HoVO_4" Physica. B165 & 166. 787-788 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 水谷 直樹: "Kapitza Resistance Between Enhanced Nuclear Spin System and Liquid ^3He" Physica. B165 & 166. 523-524 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中島 哲夫: "An Eirden 4 of the Structure Transformation at 150mK in HoーElpasolite observed By SRーXーRay Topography" Pysica. B165 & 166. 328-329 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Suzuki, T. Sakon and N. Mizutani: "Experiment on nuclear spin ordering in Sc metal" Physica. B165 & 166. 795-796 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Suzuki and M. Ono: "Antiferromagnetic ronance of hyperfine enhanced nuclear sp of Ho in HoVO_4." Physica. B165 & 166. 787-788 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Hizutani, H. Suzuki and M. Ono: "Magnetic Kapitza resistance between enhanced nucear spin system and liquid ^3He." Physica. B165 & 166. 523-524 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakajima, H. Suzuki and T . Tsutsumi: "Anevedtnce of the structure transformation at 150 mk in Ho-elpasolite observed by X-ray topograohy." Physica. B165 & 166. 915-916 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Suzuki, M . Ono and N. Mizutani: "Antiferro magnetic resonance of hyperfine enhanced nuclear antiferromagnet HoVO_4." Proc. of Symposium on Quantum Fluids and Solidsー1989. 328-329 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Masuda and H. Suzuki: "Hyperfine enhance nuclear magnetism of Cs_2NaHoCl_6." J. Low Tem. Phys.75. 159-186 (1989)

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

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Published: 1993-08-12  

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