• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2002 Fiscal Year Final Research Report Summary

Summary of research on anomalous magnetic properties associated with orbital ordering and fluctuations

Research Project

Project/Area Number 11220201
Research Category

Grant-in-Aid for Scientific Research on Priority Areas (B)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionUniversity of Tokyo (2000-2002)
Hokkaido University (1999)

Principal Investigator

SAKAKIBARA Toshiro.  Univ. of Tokyo, Inst. For Solid State Physics., Professor, 物性研究所, 教授 (70162287)

Co-Investigator(Kenkyū-buntansha) UEDA Kazuo  Univ. of Tokyo, Inst. For Solid State Physics, Professor, 物性研究所, 教授 (70114395)
OHKAWA Fusayoshi.J  Hokkaido Univ., Dept. of Physics, Professor, 大学院・理学研究科, 教授 (00107442)
AMITSUKA Hiroshi  Hokkaido Univ., Dept. of Physics, Associate Professor, 大学院・理学研究科, 助教授 (40212576)
Project Period (FY) 1999 – 2001
Keywordsmultipole order / neutron scattering / uniaxial pressure / field-induced gap / filled skutterudite / metal-insulator transition / hidden order parameter / orbital degeneracy
Research Abstract

In this project, we have investigated various phase transition phenomena and unusual magnetic properties originating from the orbital degrees of freedom in f electron systems, with special interest in the antiferro-quadrupolar (AFQ) transition, hidden order, and metal-insulator transitions.
We established the magnetic phase diagram of the typical AFQ ordering system PrPb3 and found that the transition temperature is enhanced in magnetic field depending on the field orientation. The results are successfully explained by magnetic interactions between field-induced antiferromagnetic moments in the AFQ phase.
In the phase IV of CexLa1-xB6, whose order parameter is still unknown, we performed magnetic measurements under uniaxial pressure and found that a strong magnetic anisotropy is induced by a pressure along the [100] direction. The results indicate that the order parameter in phase IV is intrinsically anisotropic, such as Gamma-5 type octupoles. In URu2Si2, neutron diffraction experiment under high pressure revealed that a non-magnetic order and an antiferromagnetic one coexist in the ordered phase of this system. Although the true order parameter of the non-magnetic phase is still unknown, the present results forces a constraint on the theoretical models of this system.
In the filled skutterudite compound PrRu4P12, the metal-insulator transition has been explained by the lattice distortion mechanism which remove the orbital degeneracy of a Gamma-3 non-Kramers doublet. The field-induced gap observed in Yb4As3 has been explained on the basis of alternating Dzyaloshinsky-Moriya interaction.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Sakakibara, (8authors): "Multipole Ordering in felectron systems"J. Phys. Chem. Solids. 63. 1147-1153 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sakakibara, (5authors): "Anomalous Uniaxial Pressure Effect on the Phase IV Ordering in CexLal-xB6"J. Phys. Soc. Jpn.. 71(Suppl.). 48-51 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuda, (3authors), H.Amitsuka: "Spatially Inhomogeneous Development of Antiferromagnetism in URu_2Si_2 : Evidence from ^<29>SiNMR under Pressure"Phys. Rev. Lett.. 87. 87203-1-87203-4 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Amitsuka, (3authors), T.Sakakibara, (5authors): "Hidden Order and Weak Antiferromagnetism in URu_2Si_2"Physica B. 312-313. 390-396 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.H.Curnoe, K.Ueda, (2authors): "Theory of Metal-Insurator Transition in PrFe_4P_<12> and PrRu_4P_<12>"J. Phys. Chem. Solids. 63. 1207-1210 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Satoh, F.J.Ohkawa: "Theory of the metamagnetic crossover in CeRu_2Si_2"Phys. Rev. B. 63. 184401-1-184401-13 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sakakibara, T. Tayama, K. Tenya, M. Yokoyama, H. Amitsuka, D. Aoki, Y. Onuki, Z. Kletowski and S. Kunii: "Mutipole Orderng in f electron systems"J. Phys. Chem. Solids. 63. 1147-1153 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakakibara, K. Tenya, M. Yokoyama, H. Amitsuka, and S. Kunii: "Anomalous Uniaxial Pressure Effect on the Phase IV Ordering in Ce_xLa_<1-x>B_6"J. Phys. Soc. Jpn.. 71, Suppl.. 48-51 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Matsuda, Y. Kohori, T. Kohara, K. Kuwahara, and H. Amitsuka: "Spatially Inhomogeneous Development of Antiferromagnetism in URu_2Si_2 : Evidence from ^<29>SiNMR under Pressure"Phys. Rev. Lett.. 87. 87203-1-4 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Amitsuka, M. Yokoyama, S. Miyazaki, K. Tenya, T. Sakakibara, W. Higemoto, K. Nagamine. K. Matsuda, Y. Kohori, and T. Kohara: "Hidden Order and Weak Antiferromagnetism in URu_2Si_2"Physica B. 312-313. 390-396 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.H. Cumoe, K. Ueda, H. Harima, and K. Takegahara: "Theory of Metal-Insulator Transition in PtFe_4P_<12> and PrRu_4P_<12>"J. Phys. Chem. Solids. 63. 1207-1210 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Satoh, and F.J. Ohkawa: "Theory of the metamagnetic crossover in CeRu_2Si_2"Phys. Rev. B. 63. 184401-1-13 (2001)

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

URL: 

Published: 2004-04-14  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi