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1998 Fiscal Year Final Research Report Summary

A Study of magnetic grand states in rare earth-transition metal compounds by neutron diffraction technique

Research Project

Project/Area Number 09650005
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionInstitute for Materials Research, Tohoku University

Principal Investigator

OHOYAMA Kenji  Institute for Materials Research, Tohoku University, 金属材料研究所, 助手 (60241569)

Co-Investigator(Kenkyū-buntansha) YAMAGUCHI Yasuo  Institute for Materials Research, Tohoku University, 金属材料研究所, 教授 (80005917)
OHASHI Masayoshi  Faculty of Technology, Yamagata University, 工学部, 助教授 (00005894)
ONODERA Hideya  Institute for Materials Research, Tohoku University, 金属材料研究所, 助手 (50005972)
Project Period (FY) 1997 – 1998
KeywordsNeutron Powder diffraction / rare earth-transition metal compounds / Quadrapoler interaction / Phase diagram
Research Abstract

The magnetism in rare earth and transition metal compounds is quite complicated and characteristic because of the coexistence and/or competition of RKKY interaction between 4f electrons and molecular fields by 3d electrons. In particular, recently, Onodera and his coworkers found evidence of the quadrapoler ordering in rare earth compounds with tetragonal crystal structures. It is, therefore, very interesting to make clear the complicated magnetism in rare earth and transition metal compounds. To understand the magnetic properties in rare earth compounds, it is quite important to decide the crystal and magnetic structures in details. Neutron diffraction technique is one of the most effective methods to make clear the static behavior of magnetic materials. We have constructed the new neutron powder diffractometer, HERMES, at the JRR-3M reactor in Japan Atomic Energy Research Institute. In this project, we have successively improved the experimental circumstance of HERMES and the experimental efficiency by the Grant-in-Aid for Scientific Research. Using HERMES, we were able to determine crystal and magnetic structures phase diagrams in many magnetic compounds. One of the most important results in this project is that we have found that the magnetic structure in the tetragonal compound DyB_2C_2 is characteristic one : the magnetic moments are in the c-plane, and are perpendicular between adjacent ones along c-axis. This characteristic magnetic structure indicates that the RKKY interaction competes with the qoadrapoler interaction. This result is very important in the study of the magnetism in rare earth compounds because this is the evidence that DyB_2C_2 is the first tetragonal compounds which undergoes the quadrapoler ordering.

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] T.Akimoto et al.: "Antiferromagnetic metallic state in doped maganites" Phys.Rev.B rapid communication. 58. R5594-R5597 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Moritomo et al.: "Antiferromagntic metallic state in the heavily doped region of perovskite manganites" Phys.Rev.B. 58. 5544-5549 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Inoue et al.: "Magnetic Structure of C14-Laves Phase DyMn2" J.Phys.Soc.Jpn. 67. 4306-4307 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahashi, et al.: "Neutron scattering study of DyB6" J.Magn.Magn.Mater. 177-181. 1097-1098 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Hori, et al.: "Magnetic properties of (Fel-xMnx)3Ga" J.Magn.Magn.Mater. 177-181. 1423-1424 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ohoyama, et al.: "The New Neutron Powder Diffractometer with a Multi-detector systemfor High-Efficiency and High-Resolution Measurements" Jpn.J.Appl.Phys. 37. 3319-3326 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ohoyama, et al.: "HERMES, the high efficiency multipurpose powder diffractometer" Physica B. 241-243. 213-215 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takahashi, et al.: "Magnetic and structual phase transition in heavy rare earth compound DyB6" Physica B. 241-243. 696-698 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Moritomo et al.: "Competition of interbilayer magnetic couplings in Rl.4Srl.6Mn207(R=Lal-zNdz)" Phys.Rev.B. 59. 157-160 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Matsuda, et al.: "Magnetic ordering of the edge-sharing CuO2 chains in Ca2Y2Cu5Ol0" J.Phys.Soc.Jpn. 68. 269-272 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yamauchi, et al.: "Magnetic Structure Modified by Quadrupolar Interaction in DyB2C2" J.Phys.Chem.Solids in press.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kubota, et al.: "Neutron Scattering Studies on Magnetic Structure of the Double-Layered Manganite La2-2xSrl+2x Mn207(0.30<x<0.50)" J.Phys.Chem.Solids in press.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Atou,et al.: "Structure determination of ferromagnetic perovskite BiMnO3" J.Phys.Chem.Solids in press.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Onimaru,et al.: "Crystal Structure of Tetragonal CellB2C2" J.Phys.Chem.Solids in press.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Yamaguchi,et al.: "Multi-Magnetic-Mode in(Crl-xMnx)2As" J.Phys.Chem.Solids in press.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Akimoto et al.: "Antiferromagnetic metallic state in doped maganites" Phys.Rev.B rapid communication. 58. R5594-R5597 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Moritomo et al.: "Antiferromagnetic metallic state in the heavily doped region of perovskite manganites" Phys.Rev.B. 58. 5544-5549 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Inoue et al.: "Magnetic Structure of C14-Laves Phase DyMn2" J.Phys.Soc.Jpn. 67. 4306-4307 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahashi, et al.: "Neutron scattering study of DyB6" J.Magn.Magn.Mater.177-181. 1097-1098 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hori, et al.: "Magnetic Properties of (Fe1-xMnx)3Ga" J.Magn.Magn.Mater.177-181. 1423-1424 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ohoyama, et al.: "The New Neutron Powder Diffractometer with a Multi-detector systemfor High-Efficiency and High-Resolution Measurements" Jpn.J.Appl.Phys.37. 3319-3326 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ohoyama, et al.: "HERMES,the high efficiency multipurpose powder diffractometer" Physica B. 241-243. 213-215 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takahashi, et al.: "Magnetic and structual phase transition in heavy rare earth compound DyB6 Physica B 241-243 (1998) 696-698" Physica B. 241-243. 696-698 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Moritomo et al.: "Competition of interbilayer magnetic couplings in R1.4Sr1.6Mn2O7 (R=La1-zNdz)" Phys.Rev.B. 59. 157-160 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Matsuda, et al.: "Magnetic ordering of the edge-sharing CuO2 chains in Ca2Y2Cu5O10" J.Phys.Soc.Jpn.68. 269-272 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Yamauchi, et al.: "Magnetic Structure Modified by Quadrupolar Interaction in DyB2C2" J.Phys.Chem.Solids. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kubota, et al.: "Neutron Scattering Studies on Magnetic Structure of the Double-Layered Manganite La2-2xSr1+2x Mn2O7 (0.30<x<0.50)" J.Phys.Chem.Solids. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Atou, et al.: "Structure determination of ferromagnetic perovskite BiMnO3" J.Phys.Chem.Solids. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Onimaru, et al.: "Crystal Structure of Tetragonal Ce11B2C2" J.Phys.Chem.Solids. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Yamaguchi, et al.: "Multi-Magnetic-Mode in (Cr1-xMnx)2As" J.Phys.Chem.Solids. (in press).

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

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Published: 1999-12-08  

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