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1998 Fiscal Year Final Research Report Summary

EXPERIMENTAL VERIFICATION AND CONTROL OF SPIN LIQUID STATE

Research Project

Project/Area Number 09440139
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

AJIRO Yoshitami  Kyushu University, Faculty of Science, Professor, 理学部, 教授 (00025438)

Co-Investigator(Kenkyū-buntansha) ASANO Takayuki  Kyushu University, Faculty of Science, Assistant Professor, 理学部, 助手 (00301333)
SOEJIMA Yuji  Kyushu University, Faculty of Science, Associated Professor, 理学部, 助教授 (10206675)
SHIRATORI Kiichi  Kyushu University, Faculty of Science, Professor, 理学部, 教授 (80028125)
Project Period (FY) 1997 – 1998
Keywordslow dimensional magneti / quantum spin / frustration / ground state / spin gap / phase transition
Research Abstract

The purpose of this project is to verify experimentally and control the possible spin liquid syate which is theoretically predicted to be exist in some low dimensional magnets, due to the quantum spin ejjects and spin frustration effects. For this purpose, we synthesized a various kind of model quantum systems and applied various complementary techniques, including advanced crystal preparation, nuclear Magnetic resonance, electron spin resonance, neutron scattering, muon spin relaxation, high field magnetization as well as sysceptobility and specific heat measurements, in cooperation with many other research groups. A summary of our research is as follows.
1) Synthesis of the model substances such as S=1/2 antiferromagnetic chain Cu (C_6H_7N)_2Br_2, S=1/2 bond alternating chain Cu (C_6H_7N)_2Cl_2, S=1/2 spin ladder Cu_2(C_5H_<12>N_2)_2Cl_4, Cu_2 (C_5H_<12>N_2) _2Bra_4 and so on.
2) Study of quantum effects of composite spin systems composed of S=1/2 subelements.
For example, we performed high-frequency ESR study up to 800GHz of trimerized chain system 3CuCI_2-2dx, in which ferromagnetic trimers consisting of three S=1/2 spins coupled antiferromagnetically in one dimension. We observed peculiar behaviors characteristic of composite spin. system with nonuniform spatial structure.
3) Control of quantum spin-gappped phase.
We explored the possible induced-phase transition in the quantum singlet ground state systems with spin gap by applying high magnetic field or by doping impurity ions. For example, we observed successive phase transitions at three restricted field regions up to 40T in the S=2/3 dimerized system Cs_3Cr_2Cl_3.

  • Research Products

    (44 results)

All Other

All Publications (44 results)

  • [Publications] T.Goto: "Hihg-field magnetization of one-dimensional S=1/2 trimer system 3CuCl_2・2dioxane" Physica. B216. 294-296 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Xun.Xu: "^<31>Br-NMRin the triangular-lattice XY antiferromagnetic CsMnBr_3 below 1K" J.Phys.:Condens.Matter. 8. L675-L679 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Asano: "The Haldane state in CsNiCl_3 detected by magnetization measurements-observation of quantum-classical crossover and the valence bond solid state-" J.Phys.Soc.Jpn. 66. 460-465 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ajiro: "ESR of“the magnetic dangling bond"in the Haldane state" J.Phys.Soc.Jpn. 66. 971-974 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.winkelmann: "The phase diagram and ceitical behaviour of the easy-plane antiferromanget CsNi_<0.98>Fe_<0.02>Cl_3" J.Phys.:Condens.Matter. 9. 703-713 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Mekata: "Spin frustration in Y(Sc)Mn_2" Hyperfine Interactions. 104. 337-342 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.M.Kojima: "Antiferromagnetic order with spacially inhomogeneous ordered moment size of Zn- and Si- doped CuGeO_3" Phys.Rev.Lett.79. 503-506 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Xun.Xu: "Nuclear magnetic relaxation and electron spin fluctuation in triangular-latice XY antiferromagnet CsMnBr_3" Physica. B239. 128-130 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Xun.Xu: "Br NMR in triangular-lattice XY antiferromagnetic CsMnBr_3 in a high external field" Physica. B239. 131-133 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Chiba: "Nuclear spin-lattice relaxation in quantum spin gap of S=1 and S=1/2 antiferromagnets" J.Magn.Magn.Mater. 177-181. 630-631 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Asano: "Magnetic phase diagram CsNi_<0.98>Fe_<0.02>Cl_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
  • [Publications] Y.Ajiro: "New interpretation of ESR of the S=1/2 broken valence bond in Zn-doped NENP" J.Magn.Magn.Mater. 177-181. 707-708 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Inagaki: "Magnetic phase transitions in triangular lattice CsNi_<0.98>Fe_<0.02>Cl_3 studied by NMR" J.Magn.Magn.Mater. 177-181. 723-724 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Mekata: "Magnetic ordering in triangulated kagome lattice compund,Cu_9Cl_2(cpa)_6・nH_2O" J.Magn.Magn.Mater. 177-181. 731-732 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.B.Jamari: "Single-crystal weak ferromagnetism of 1,3,5-triphenyl-6-oxoverdazyl free radical and ferromagnetc behavior of (TOV)_<1-x>(TOV-H)_x diluted system" J.Magn.Magn.Mater. 177-181. 789-791 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Uyeda: "^<79.81>Br NMR in triangular lattice antiferromagnet CsCoBr_3" J.Magn.Magn.Mater. 177-181. 833-834 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ajiro: "High-resolution, high-field magnetization measurement in the diluted antiferromagnet RbMn_cMg_<1-c>F_3: new application of pulsed high fields to adiabatic magnetizaion processes" Physica. B246-247. 222-225 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Fukuda: "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
  • [Publications] M.Chiba: "High field NMR on level crossover in spin-gap systems" Physica. B246-247. 576-579 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Karen: "^<69,71>Ga NMR in the kagome lattice compound SrC_<9-x> G_<3+x> O_<19>" Physica.Rev.B57. 10745-10749 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Inagaki: "Succesive Phase Transition of Singlet Ground Stare System Cs_3Cr_2Cl_9 under External Magnetic Field up to 40T" Proceedings of 4th International Symposium on Advanced Physical Fields. now printing.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kikuchi: "High Field Magnetizations of S=1 Antiferromagnets with Bond Alternation" Proceedings of 4th International Symposium on Advanced Physical Fields. now printing.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Goto: "High-field magnetization of one-dimensional S=1/2 trimer system 3CuCl_2・2dioxane" Physica. B216. 294-296 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Xun.Xu: "Br-NMR in the triangular-lattice XY antiferromagnetic CsMnBr_3 below 1K" J.Phys. : Condens.Metter. 8. 675-679 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Asano: "The Haldane state in CsNiCl3 detected by megnetization easurements-observation of quantum-classical crossover and the valence bond solid state-" J.Phys.Soc.Jpn.66. 460-465 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ajiro: "ESR of "the magnetic dangling bond" in the Haldane state" J.Phys.Soc.Jpn. 66. 971-974 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Winkelmann: "The phase diagram and acitical behavior of the easy-plane antiferromanget CsNi_<0.98>Fe_<0.02>Cl_3" J.Phys. : Condens.Matter. 9. 703-713 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mekata: "Spin frustration in Y (Sc) Mn_2" Hyperfine Interactions. 104. 337-342 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.M.Kojima: "Anitferromagnetic order with spacially inhomogeneous ordered moment size of Zn- and Si-doped CuGeO_3" Phys.Rev.Lett.79. 503-506 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Xun.Xu: "Nuclear magnetic relaxation and electron spin fluctuation in triangular-latice XY antiferromagnet CsMnBr_3" Physica. B239. 128-130 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Xun.Xu: "Br NMR in triangular-lattice Xy antiferromagnetic CsMnBr_3 in a high external field" Physica. B239. 131-133 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Chiba: "Nuclear spin-lattice relaxation in quantum spin gap of S=1and S=1/2antiferromagnets" J.Magn.Magn.Mater. 177-181. 630-631 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Asano: "Magnetic phase diagram CsNi_<0.98>Fe_<0.02>Cl_3 : mgnetization and specific heat" J.Magn.Magn.Mater. 177-181. 640-642 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ajiro: "New interpretation of ESR of the S=1/2 broken valence bond in Zn-doped NENP" J.Magn.Magn.Mater. 177-181. 707-708 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Inagaki: "Magnetic phase transitions in triangular lattice CsNi_<0.98>Fe_<0.02>Cl_3 studied by NMR" J.Magn.Magn.Mater. 177-181. 723-724 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Mekata: "Magnetic ordering in triangulated kagome lattice compund, Cu_9Cl_2 (cpa)_6・nH_2O" J.Magn.Magn.Mater. 177-181. 731-732 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.B.Jamali: "Single-crystal weak ferromagnetism of 1,3,5-triphenyl-6-oxoverdazyl free radical and ferromagnetc behavior of (TOV)_<1-x>(TOV-H)_2 diluted system" J.Magn.Magn.Mater. 177-181. 789-791 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Uyeda: "^<79,81>Br NMR in triangular lattice antiferromagnet CsCoBr_3" J.Magn.Magn.Mater. 177-181. 833-834 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Ajiro: "High-resolution, high-field magnetization measurement in the diluted antiferromagnet RbMn_cMg_<1-c>F_3 : new application of pulse high fields to adiabatic magnetization processes" Physica. B246-247. 222-225 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Fukuda: "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(欧文)」より
  • [Publications] M.Chiba: "High field NMR on level crossover in spin-gap systems" Physica. B246-247. 576-579 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Karen: "^<69,71>Ga NMR in the kagome lattice compound SrC_<9-x>G_<3+x>O_<19>" Physica.Rev. B57. 10745-70149 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Inagaki: "Succesive Phase Transition of Singlet Ground Stare System Cs_3Cr_2Cl_9 under External Magnetic Field up to 40T" Proceedings of 4th International Symposium on Advanced Physical Fields. (now printing).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kikuchi: "High Field Magnetizations of S=1 Antiferromagnets with Bond Alternation" Proceedings of 4th International Symposium on Advanced Physical Fields. (now printing).

    • 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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