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2000 Fiscal Year Final Research Report Summary

Search for New A'_3ABO_6-Type 1D-Antiferromagnets and Research on Their Physical Properties-around Ca_3Co_2O_6

Research Project

Project/Area Number 11440195
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic chemistry
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

KOSUGE Koji  Kyoto Univ., Graduate School of Sci., Prof., 大学院・理学研究科, 教授 (00025371)

Co-Investigator(Kenkyū-buntansha) KATO Masaki  Kyoto Univ., Graduate School of Sci., Instructor, 大学院・理学研究科, 助手 (90271006)
Project Period (FY) 1999 – 2000
Keywords2D-Triangular-Lattice Antiferromagnet / 1D-Ferromagnetic Chain / Transition-Metal Compound / Magnetic Frustration / Neutron Diffraction / High-Field Magnetization
Research Abstract

In this study, we have precisely investigated which metal-elements can be put into the A', A and B sites in the A'_3ABO_6 compounds with K_4CdCl_6-type structure in order to clarify the general stability condition of this structure. Thus, the purpose of the study is to search the new various 1D-magnets with this structure by utilizing the obtained conditions and to investigate their physical properties. Experimental results are as follows.
Searching the new compounds with the K_4CdCl_6-type structure, we have been succeeded in synthesizing these three new compounds : Ca_3CoIrO_6, Ca_3CoRuO_6 and Ca_3CoRhO_6. Especially, Ca_3CoRhO_6 indicates the behaviors of the 2D-triangular lattice antiferromagnets (2D-TLA) with the Ising-type ferromagnetic spin chains just as the case with Ca_3Co_2O_6, both of which indicate two Neel temperature, T_<N1> and T_<N2>. In the temperature regime between T_<N1> and T_<N2>, the magnetic state of Ca_3CoRhO_6 has been found to be the partially disordered antiferromagnetic (PDA) one, which is characteristic to the case of the 2D-TLA, investigated by neutron diffraction experiments. This is the first observation of the PDA state in the 2D-TLA with Ising-type ferromagnetic chains, although the PDA state has been hardly thought to be realized in the 2D-TLA case with the ferromagnetic chains. Furthermore, the PD spin chains have been found to be frozen randomly below T_N, because the ferromagnetic hatchings can hardly flip up to down and down to up. Consequently, the transition at T_N is that from the PDA state to the spin glass state with decreasing temperature, below which the coexistence state is realized of 2/3 antiferromagnetic chains and 1/3 frozen spin chains. In order to break the frozen state and to flip the spin chain, we found to need very high magnetic fields more than several 10 T at least. Further investigations are necessary for fully understanding of the low dimensional magnetic systems.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] A.Irizawa: "Magnetic and Electrical Properties in BaNiS_2-Type Solid Solutions"J.Phys.Soc.Jpn.. 69(10). 3408-3413 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kato: "One-dimensional magnetic behavior of CuSb_2O_6"Physica B. 281&282. 663-664 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nakanishi: "Anomalous field-induced magnetic transitions in V_5X_8 (X=S, Se)"J.Magn.Magn.Mat.. 221. 301-306 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kato: "Temperature Induced Metal Insulator Transition in Bi_xV_8O_<16>"J.Phys.Soc.Jpn.. 70(2). 325-328 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kato: "^<23>Na-NMR Study in NaV_6O_<11>"J.Phys.Soc.Jpn.. 70(5). 1701-1707 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Niitaka: "High-Field Magnetization and Neutron Diffraction Studies of One-Dimensional Compound Ca_3CoRhO_6"J.Phys.Soc.Jpn.. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Irizawa, K.Yoshimura and K.Kosuge: "Magnetic and Electrical Properties in BaNiS_2-Type Solid Solutions"J.Phys.Soc.Jpn.. 69(10). 3408-3413 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kato, A.Hatazaki, K.Yoshimura and K.Kosuge: "One-dimensional magnetic behavior of CuSb_2O_6"Physica B. 281&282. 663-664 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nakanishi, K.Yoshimura, K.Kosuge, T.Goto, T.Fujii and J.Takada: "Anomalous field-induced magnetic transitions in V_5X_8 (X=S, Se)"J.Magn.Magn.Mat.. 221. 301-306 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kato, T.Waki, M.Kato, K.Yoshimura and K.Kosuge: "Temperature Induced Metal Insulator Transition in Bi_xV_8O_<16>"J.Phys.Soc.Jpn.. 70(2). 325-328 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kato, M.Kato, K.Yoshimura and K.Kosuge: "^<23>Na-NMR Study in NaV_6O_<11>"J.Phys.Soc.Jpn.. 70(5). 1701-1707 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Niitaka, H.kageyama, K.Yoshimura, K.Kosuge, S.Kawano, N.Aso, A.Mitsuda, H.Mitamura and T.Goto: "High-Field Magnetization and Neutron Diffraction Studies of One-Dimensional Compound Ca_3CoRhO_6"J.Phys.Soc.Jpn.. 70(5)(in press). (2001)

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

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Published: 2002-03-26  

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