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1995 Fiscal Year Final Research Report Summary

Magnetic Ordering Process in Geometrically Frustrated Systems

Research Project

Project/Area Number 06452059
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionFukui University

Principal Investigator

MEKATA Mamoru  Fac. Engineering, Fukui Univ. Prof., 工学部, 教授 (80025345)

Co-Investigator(Kenkyū-buntansha) TAKAGI Takeo  Fac. Engineering, Fukui Univ. Lect., 工学部, 講師 (00206723)
AJIRO Yoshitami  Fac. Engineering, Fukui Univ. Assis. Prof., 工学部, 助教授 (00025438)
Project Period (FY) 1994 – 1995
KeywordsGeometrical frustration / 3 dimensional competition / Ground state / Spin fluctuations / Spin freezing / Neutron spin echo / muSR / NMR
Research Abstract

The results of the research on geometrically frustrated systems are as follow.
1) Magnetic ordering process in CsNiCl_3-type compounds
NMR spectra of CsFeBr_3 and RbFeBr_3 turn to powder patterns in certain temperature range just below T_N indicating randomness of mutual phases of adjacent magnetic layrs with 120゚ structure. But it is not yet known whether the randomness is static or dynamic. It was also found that NMR signal in the intermediate temperature phase of CsCoBr_3 due to fluctuations of the internal field caused by domain wall solitons which was revealed to survive down to the low temperature phase. The magnetic structure at high magnetic fields of CsNiCl_3 was identified to be as predicted bu theory.
2) Crystalline field splitting and magnetic phase diagram in FeI_2
An electronic transition associated with the crystalline field splitting was observed around 100K by ESR and muSR in FeI_2. Measurements of magnetization on FeI_2 in intense magnetic fields revealed the absence of t … More he tricritical point speculated previously which may be related to the first order transition at T_N.
3) Impurity effect on spin symmetry in CuFeO_2
Al doping to CuFeO_2 was found to change the Ising spin system to a Heisenberg system, but the experimental results concerning the crossover concentration as well as the coexistence of both systems are not yet consistent with each other.
4) Ground state of three dimensional competing system with corner shared tetrahedrons
Remarkable spin fluctuations probed by muon spin relaxation survive down to 0.1K in SrCr_8Ga_4O_<19> with Kagome lattice composed of corner shared tetrahedrons, whereas neutron spin echo revealed the spin freezing below 3.5K consistently with the field cooling effect observed in the magnetic susceptibility. Similarly spin freezing was observed below 2K by means of muSR in Y (Sc) Mn2 although no anomaly in the relaxation time of NMR has been detected by NMR down to 0.07K.Thus in strongly frustrated systems with corner shared tetrahedronsan spins freeze at low temperatures. The spin freezin in the geometrically frusatrated systems has different features from that in random spin systems. The elucidation of the difference is a future problem. Less

  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] T.Asano: "Magnetic Phase Diagram of the Triangular Lattice Anti-ferromagnet ABX_3 under High Magnetic Field." Physica. B201. 75-79 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ajiro: "Neutron Diffraction and High Field Magnetization Study of Magnetic Phase Transition in the Triangular Lattice Antiferromagnet ABX_3." Physica. B213-214. 209-211 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kato: "Magnetic Phase Transition in a Distorted Triangular Lattice Antiferromagnet RbMnBr_3." Physica. B213&214. 182-184 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kohmoto: "Nuclear Magnetic Relaxation in the Ising-like Antiferromagnet CsCoCl_3: Domain Wall Pairing in the 3D Ordered Phase." Phys.Rev.B49. 6028-6039 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kohmoto: "Sublattice Switching in Three Dimensional Ordered Phase of the Triangular Lattice Amtiferromagnet CsCoCl_3." Phys.Rev.B64. 12526-12529 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Mekata: "Magnetic ordering in CsCuCl_3." J.Magn.Magn.Mater.140-141. 1987-1988 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Chiba: "NMR Study of the Field-Induced Phase Transition in CsCuCl_3 due to S=1/2 Quantum Effect." J.Magn.Magn.Mater.140-141. 1673-1674 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takagi: "New Partial Disordered Phases with Commensurate Spin Density Wave in Frustrated Triangular Lattice Amtiferromagnets." J.Phys.Soc.Jpn.64. 4009-4027 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takeda: "Thermal Analysis of Freedom of Spin in Partially Disordered State of the Antiferromagnetic Triangular Lattice in CuFeO_2." J.Phys.Soc.Jpn.63. 2017-2020 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ajiro: "High Field Magnetization Process in the Triangular Lattice Antiferromagnet CuFeO2 up to 100T." Physica. B201. 71-74 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Mitsuda: "Magnetic Ordering of CuFe_<1-X>Al_XO_2." Physica. B213&B214. 194-196 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ajiro: "Impurity Effect on the Stability of the Ground-State Spin Configuration in Triangular Lattice Antiferromagnet CuFeO_2." J.Phys.Soc.Jpn.64. 3643-3646 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Oohara: "Neutron Diffraction Study of AgCrO_2." J.Phys.Soc.Jpn.63. 847-848 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Mekata: "Magnetic Structure of Antiferromagnetic PdCrO_2: A Possible Degenerate Helices in a Rhombohedral Lattice." Physica. B213&214. 221-223 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Keren: "Muon Spin Relaxation Measurements in Kagome Lattice System SrCr_8Ga_4O_<19>." Hyperfine Interactions. 85. 181-186 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.J.Uemura: "Spin Fluctuations in Frustrated Kagome System SrCr_8Ga_4O_<19> Studied by Muon Spin Relaxation." Phys.Rev.Lett.73. 3306-3309 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Mekata: "Is Y(Sc)Mn_2 really Spin Liquid?" J.Magn.Magn.Mater.140-141. 1767-1768 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Asano, Y.Ajiro, M.Mekata, H.Aruga Katori and T.Goto: "Magnetic Phase Diagram of the Triangular Lattice Autiferromagnet ABX_3 under High Magnetic Field." Physica. B201. 75-79 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ajiro, T.Asano, M.Kadowaki, T.Kato, S.Kawano, H.Katori and T.Goto: "Neutron Diffraction and High Field Magnetization Study of Magnetic Phase Transition in the Triangular Lattice Antiferromagnet ABX_3." Physica. B213 & 214. 209-211 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kato, T.Asano, Y.Ajiro, S.Kawano, T.Ishii and K.Iio: "Magnetic Phase Transitions in a Distorted Triangular Lattice Antiferromagnet RbMnBr_3." Physica. B213 & 214. 182-184 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kohmoto, T.Goto, S.Maegawa, N.Fujiwara, Y.Fukuda, M.Kunitomo and M.Mekata: "Nuclear Magnetic Relaxation in the Ising-like Antiferromagnet CsCoCl_3 : Domain-wall Pairing in the 3D Ordered Phase." Phys. Rev.B49. 6028-6039 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Khomoto, T.Goto, S.Maegawa, N.Fujiwara, Y.Fukuda, M.Kunitomo and M.Mekata: "Sublattice Switching in the Three-dimensional Ordered Phase of the Triangular-lattice Antiferromaget CsCoCl_3." Phys. Rev.B52. 12526-12529 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mekata, Y.Ajiro, T.Sugino, A.Oohara, K.Ohara, S.Yasuda, Y.Oohara and H.Yoshizawa: "Magnetic Ordering in CsCuCl_3." J.Magn. Magn. Mater.140-141. 1987-1988 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Chiba, Y.Ajiro and T.Morimoto: "NMR Study of the Field-Induced Phase Transition in CsCuCl_3 due to S=1/2 Quantum Effect." J.Magn. Magn. Mater.140-144. 1673-1674 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Takagi and M.Mekata: "New Partial Disordered Phases with Commensurate Spin Density Wave in Frustrated Triangular Lattice Antiferromagnets." J.Phys. Soc. Jpn.64. 4009-4027 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Takeda, K.Miyake, M.Hitaka, T.Kawase, N.Yaguchi and M.Mekata: "Thermal Analysis of Freedom of Spin in Partially Disordered State of the Antiferromagnetic Triangular Lattice in CuFeO_2." J.Phys. Soc. Jpn.63. 2017-2020 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ajiro, T.Asano, T.Takagi, M.Mekata, H.Aruga Katori and T.Goto: "High-field Magnetization Process in the Triangular Lattice Antiferromagnet CuFeO_2 up to 100T." Physica. B201. 71-74 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Mitsuda, Y.Matsumoto, T.Wada, K.Kurihara, Y.Urata, H.Yoshizawa and M.Mekata: "Magnetic Ordering of CuFe_<1-x>Al_xO_2" Physica. B213 & 214. 194-196 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ajiro, K.Hanasaki, T.Asano, T.Takagi, M.Mekata, H.Aruga-Katori and T.Goto: "Impurity Effect on the Staility of the Ground State Spin Configuration in Triangular Lattice Antiferromagnet CuFeO_2." J.Phys. Soc. Jpn.64. 3643-3646 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Oohara, S.Mitsuda, H.Yoshizawa, N.Yaguchi, H.Kuriyama, T.Asano and M.Mekata: "Neutron Diffraction Study of AgCrO_2." J.Phys. Soc. Jpn.63. 847-848 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mekata, T.Sugino, A.Oohara, Y.Oohara and H.Yoshizawa: "Magnetic Structure of Antiferromagnetic PrCrO_2. A Possible Degenrate Helices on a Rhombohedral Lattice" Physica. B213 & 214. 221-223 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Keren, L.P.Le, G.M.Luke, W.D.Wu, Y.J.Uemura, M.Mekata, Y.Ajiro, H.Kuriyama, T.Asano and H.Kikuchi: "Muon Spin Relaxation Measurements in Kagome Lattice System SrCr_8Ga_4O_<19>." Hyperfine Interactions. 85. 181-186 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.J.Uemura, A.Keren, K.Kojima, L.P.Le, G.M.Luke, W.D.Wu.Y.Ajiro, T.Asano, K.Kuriyama, M.Mekata, H.Kikuchi and K.Kakurai: "Spin Fluctuations in Frustrated Kagome Lattice System SrCr_8Ga_4O_<19> Studied by Muon Spin Relaxation." Phys. Rev.Lett.73. 3306-3309 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mekata, T.Asano, T.Sugino, H.Nakamura, N.Asai, M.Shiga, A.Keren, K.Kojima, G.M.Luke, W.D.Wu, Y.J.Uemura, S.Dunsinger and M.Gingras: "Is Y (Sc) Mn_2 really Spin Liquid?" J.Magn. Magn. Mater.140-141. 1767-1768 (1995)

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

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Published: 1997-03-04  

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