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Spacio-temporal Correlatins and Ground States in Strongly Frustrated Systems

Research Project

Project/Area Number 09640427
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
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.Assis.Prof., 工学部, 助教授 (00206723)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsFrustration / Ground state / Triangular Lattice / Kagome Lattice / Tetrahedron Lattice / Singlet State / Quantum Effect / 四面対格子
Research Abstract

The present study was performed to reveal the spacio-temporal correlations and quantum effect in strongly competing systems due to geometrical frustration by means of magnetic measurements on model compounds and computer simulation. The studied model compounds include CsNi(Fe)Cl_3 and BaVS_3 with the triangular lattice of magnetic chains, delafossite type compounds CuFe_<0.95>Al_<0.05>O_2 and A gNiO_2 with the rhombohedrally stacked triangular lattice, SrCr_8Ga_4O_<19> with the Kagome lattice, Cu_9X_2(cpa)_6 nH_2O (X=F,Cl, Br) with the triangulated Kagome lattice, beta-Mn with the corner sharing triangle lattice in three dimension and Y(Sc)Mn_2 with the corner sharing tetrahedron lattice.
The observed ground states of these model compounds may be divided in several groups. CsNi(Fe)C1_3 and CuFe_<0.95> Al_<0.05>O_2 exhibit long range orders due to magnetic interaction between further neighbor spins than the nearest but have complicated magnetic structures due to spin frustration. Frustration gives rize to an orbital ordering in BayS3 with orbital degeneracy. The others have ground states with frozen spins which are different from conventional spin glasses in negative Weiss temperature of large magnitude. Each spinfrozen state exhibits individual features. The reciprocal magnetic susceptibility of SrCr_8Ga_4O_<19> and Cu_6X2(cpa)_3 nH_2O change the temperature gradient at much higher temperature than the spin freezing indicating singlet formation due to quantum effect. The spin freezing found in beta-Mn and Y(Sc)Mn_2 was attributed to the spin freezing of moments induced by lattice defects and it was concluded that the majority spins in these compounds are in spin liquid state. The conditions which determine the classical spin freezing and the quantum freezing are still future problem.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] 目片 守 他: "Spin Frustration in Y(Sc)Mn_2" Hyperfine Interactions. 140・1. 337-342 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Keren 他: "^<69.71>Ga NMR in the Kagome Lattice Compound SrCr_<9-x>Ga_<3+x>O_<19>" Phys.Rev.B57・17. 10745-10749 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 浅野貴行 他: "Maguetic Phase Diagram of CsNi_<1-x>Fe_xCl_3 : Magnetization and specific Heat" J.Magn.Magn.Mater.177-181. 640-642 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 植村泰朋 他: "Neutron Spin Echo Studies of SrCr_8Ga_4O_<19>." J.Magn.Magn.Mater.177-181. 701-702 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 稲垣裕次 他: "Magnetic Phase Transitions in Triangular Lattice CsNi_<0.98>Fe_<0.02>Cl_3 studied by NMR." J.Magn.Magn.Mater.177-181. 723-725 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 目片 守 他: "Magnetic Ordering in Triangulated Kagome Lattice Compound, Cu_9Cl_2(cpa)_6・nH_2O" J.Magn.Magn.Mater.177-181. 731-3733 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 福田哲也 他: "Submillimeter Wave ESR Study on Triangular Lattice Antiferromagnet CuFeO_2." Physica. B246-247. 569-571 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 小林 豊 他: "Monte Carlo Simulation for Ising Spins on Corner Sharing-Tetrahedron Lattices" J.Phys.Soc.Jpn.67・11. 3006-3012 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 目片 守 他: "Spin Freezing in Geometrically Frustrated β-Mn Probed by Muon Spin Relaxation" Hyperfine Interactions. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 中村裕之 他: "Muon Spin Relaxation in Orbital-ordered BaVS_3." Hyperfine Interactions. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 菊池彦光 他: "μSR Study of S=1/2 Triangular Lattice Antiferromagnet AgNiO_2." Hyperfine Interactions. 印刷中. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Asano, Y.Ajiro, M.Mekata, K.Kamishima, T.Goto, H.Aruga Katori, K.Katsumsata: "Magnetic Phase Diagram of CsNi_<1-x>Fe_xCl_3 : Magnetization and specific Heat" j.Magn.Magn.Mater.177-181. 640 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Inagaki, N.Granito, T.Asano, Y.Ajiro, M.Mekata: "Magnetic Phase Transitions in Triangular Lattice CsNi_<0.98>Fe_<0.02>Cl_3 stidied by NMR." J.Magn.Magn.Mater.177-181. 723 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Nakamura, H.Imai, M.Mekata, M.Shiga, K.Nishiyama and K.Nagamine: "Muon Spin Relaxation in Orbital-ordered BaVS_3" Hyperfine Interactions. in press. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Fukada, H.Nojiri, M.Motokawa, T.Asano, M.Mekata, Y.Ajiro: "Submillimeter Wave ESR Study on Triangular Lattice Antiferromagnet CuFeO_2" Physica. B246-247. 569 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Kikuchi, H.Nagasawa, M.Mekata, Y.Fudamoto, K.Kojima, G.M.Luke, Y.J.Uemura, H.Mamiya and T.Naka: "muSR Study of S=1/2 Triangular Lattice Antiferromagnet AgNiO_2" Hyperfine Interactions. in press. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.J.Uemura, B.D.Gaulin, M.Mekata, I.Mirabeau, S.Pouget, J.L.Tholence: "Neutron Spin Echo Studies of SrCr_8Ga_4O_<19>" J.Magn.Magn.Mater.177-181. 701 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Keren, P.Mendels M.Horvatic, F.Ferrer, Y.J.Uemura, M.Mekata, T.Asano: "Ga NMR in the Kagome Lattice Compound SrCr_<9-x>Ga_<3+x>O_<19>" Phys.Rev. B57. 10745 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Mekata, M.Abudlla, T.Asano, H.Kikuchi, T.Goto, T.Morishita, H.Hori: "Magnetic Ordering in Triangulated Kagome Lattice Compound, Cu_9Cl_2 (cpa) _6・nH_2O" J.Magn, Magn.Mater.177-181. 731 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Mekata, T.Asano, H.Nakamura, M.Shiga, K.Kojima, G.M.Luke, A.keren, W.D.Wu, Y.J.Uemura, S.Dunsinger and M.Gingras: "Spin Frustration in Y (Sc) M_2n" Hyperfine Interactions. 104. 337 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Mekata, T.Asano, H.Nakamura, M.Shiga, K.M.Kojima, G.M.Luke, A.Keren, W.D.Wu, Y.J.Uemura, S.Dunsinger and M.Gingas: "Ground State of Geometrically Frustrated System Y (Sc) Mn_2 Studies by Muon Spin Relaxation." Phys.Rev.Lett.Submitted.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Kobayashi, T.Takagi and M.Mekata: "Monte Carlo Simulation for Ising Spins on Corner Sharing Tetrahedron Lattices." J.Phys.Soc, Jpn. 67. 3006 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Mekata, H.Nakamura, M.Shiga, G.M.Luke, K.Kojima, B.Nachumi, M.Larkin, Y.Fudamoto and Y.J,Uemura: "Spin Freezing in Geometrically Frustrated beta-Mn Probed by Muon Spin Relaxaion" Hyperfine Interactions. in press. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Keren 他: "^<69.71>Ga NMR in the Kagome Lattice Compound SrCr_<9x>Ga_<3+x>O_<19>" Phys.Rev.B57・17. 10745-10749 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 浅野貴行 他: "Magnetic Phase Diagram of CsNi_<1-x>Fe_xCl_3:Magnetization and specific Heat" J.Magn.Magn.Mater.177-181. 640-642 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 植村泰朋 他: "Neutron Spin Echo Studies of SrCr_8Ga_4O_<19>." J.Magn.Magn.Mater.177-181. 701-702 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 稲垣裕次 他: "Magnetic Phase Transitions in Triangular Lattice CsNi_<0.98>Fe_<0.02>Cl_3 studied by NMR." J.Magn.Magn.Mater.177-181. 723-725 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 目片 守 他: "Magnetic Ordering in Triangulated Kagome Lattice Compound, Cu_9Cl_2(cpa)_6・nH_2O" J.Magn.Magn.Mater.177-181. 731-3733 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 福田哲也 他: "Submillimeter Wave ESR Study on Triangular Lattice Antiferromagnet CuFeO_2." Physica. B246-247. 569-571 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 小林 豊 他: "Monte Carlo Simulation for Ising Spins on Corner Sharing-Tetrahedron Lattices" J.Phys.Soc.Jpn.67・11. 3006-3012 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 目片 守 他: "Spin Freezing in Geometrically Frustrated β-Mn Probed by Muon Spin Relaxation" Hyperfine Interactions. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 中村裕之 他: "Muon Spin Relaxation in Orbital-ordered BaVS_3." Hyperfine Interactions. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 菊池彦光 他: "μSR Study of S=1/2 Triangular Lattice Antiferromagnet AgNiO_2." Hyperfine Interactions. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 目片 守、浅野貴行、他: "Spin Frustration in Y(Sc)Mn_2" Hyperfine Interactions. 140.1. 337-342 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2020-05-15  

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