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Study of the quantum properties and dissipative phenomena in molecular

Research Project

Project/Area Number 11440112
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  Graduate School of Sciences KYUSHU UNIVERSITY, Prof., 大学院・理学研究院, 教授 (00025438)

Co-Investigator(Kenkyū-buntansha) ASANO Takayuki  Graduate School of Sciences KYUSHU UNIVERSITY, Res. Asso., 大学院・理学研究院, 助手 (00301333)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 2000: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1999: ¥11,500,000 (Direct Cost: ¥11,500,000)
Keywordsnanoscale / quantum property / quantum energy level / dissipation / molecular magnet / polynuclear complex / pulse magnetization
Research Abstract

The magnetic properties of molecular clusters attract considerable interest for the new physics involved and for the potential applications. At low temperatures, these molecules act as individual quantum nanomagnets, enabling to probe, at the macroscopic scale, the crossover between quantum and classical physics. Of fundamental interest is the situation of degeneracy of two magnetic levels, where quantum mechanical phenomena such as tunneling or coherence can occur. The situation of degeneracy between levels raises fundamental problems of quantum dynamics. A crucial issue is the role played by the coupling between magnetic molecular levels and the environment such as phonons. The purpose of this project is to verify experimentally the characteristic quantum energy levels and discuss the possible interplay between the anomalous magnetic relaxation phenomena and the level-crossings. For this purpose, a variety of model substances were synthesized by our group and some of them were kindly … More supplied by chemists. The representatives are dimers (binuclear complexes) such as Cs3Cr2C19 with X=Cl, Br, trimers (trinuclear complexes) such as A3Cu3(PO4)4 with A=Ca, Sr, trimerized chain system 3CuCl2・2dx, polynuclear molecular magnets such as Mn12, Fe12, V15 and so on We 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 susceptibility and specific heat measurements, in cooperation with many other research groups. A high-field magnetization technique was applied to study the field-dependent behaviors of various kind of quantum spin systems by applying high magnetic field up to 54 T at temperature down to 0.1 K.For example, we observed successive phase transitions at three restricted field regions up to 40T in the S=2/3 dimerized system Cs3Cr2Cl9. Also, in Fe12 molecular magnet which forms a finite chain ring consisting of 12 Fe3+(S=5/2) ions, we observed five magnetization steps with equal field spacing, arising from energy-level crossings for the discrete quantum states in the finite spin system. In these examples, we discussed the structure of the energy levels an d the relaxation phenomena due to quantum spin dynamics in the metastable states around the level-crossing fields. Also, a high-frequency electron spin resonance (ESR) technique was applied for our purpose, in the wide temperature range down to 0.5 K, using high frequency sources up to 800 GHz. Examples are for the S=1/2 Heisenberg anttiferromagnetic chain system Cu-benzoate, Cu(C6H5COO)2・3H2O and for the trimerized chain system 3CuCl2・2dx, in which ferromagnetic trimers consisting of three S=1/2 spins coupled antiferromagnetically in one dimension.
These results partly have been published already. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (49 results)

All Other

All Publications (49 results)

  • [Publications] Y.Ajiro et al.: "High-Field, High-Frequency ESR in the One-Dimensional Quantum Spin Systems"J.Phys.Soc.Jpn.(Suppl.A). 69. 297-302 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al.: "High field ESR in one-dimensional quantum spin systems"Physica B. 284-288. 1625-1626 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al.: "mSR Study of 1 : 1 Complex of {Mn (hfac) 2} with diazodi (4-pyridyl) methan as a Photoresponsible Magnetic Coupler"Mol.Cryst.Liq.Cryst.. 343. 103-108 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al.: "Magnetism of 1D quantum Ferrimagnets, A3Cu3 (PO4) 4 with A=Ca,Sr"J.Phys.Soc.Jpn.. 70(in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Mekata et al.: "Ground state of the geometrically frustrated system Y (Sc) Mn2 studied by muon spin relaxation"Phys.Rev.. B61. 4088-4092 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Nojiri et al.: "Submillimeter-wave ESR Study on Quantum Spin Systems"J.Phys.Soc.Jpn.(Suppl.B). 69. 83-88 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Keren et al.: "Magnetic Dilution in the Geometrically Frustrated SrCr9pGa12-9pO19 and the Role of Local Dynamics : A Muon Spin Relaxation Study"Phys.Rev.Lett.. 84. 3450-3453 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Asano et al.: "ESR Investigation on the Breather Mode and the Spinon-Breather Dynamical Crossover in Cu Benzoate"Phys.Rev.Lett.. 84. 5880-5883 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kikuchi et al.: "Susceptibility and higt-field magnetization of one dimensional S=1/2 Heisenberg antiferromagnet with next-nearest exchange interaction"Physica B. 284-288. 1631-1632 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Asano et al.: "High-Field Magnetization Process in Free Radical and Metal-Assembled Molecular magnet"Mol.Cryst.Liq.Cryst.. 343. 109-114 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Inagaki et al.: "High-Field Magnetization and High-Frequency ESR Study on the Tetranuclear Cluster Composed of pi-Electrons (S=1/2) and d-Electrons (S=5/2)"Mol.Cryst.Liq.Cryst.. 343. 115-120 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Fukita et al.: "Trinuclear Cu (II) M (II) Cu (II) complexes of an oxamide/dioxime ligand and extension to a bimetallic magnetic compound"J.Chem.Soc.,Dalton Trans.. 64-70 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] J.B.Jamali et al: "Alloying Effects on Intermolecular Magnetic Interaction in Verdazyl Radical Alloy Crystal.(TOV)1-x(TOV-H)x, x-0.0〜0.09(TOV : 1,3,5-Triphenyl-6-Oxoverdazyl)"Mol. Cryst. Liq. Cryst.. 334. 121-130 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al: "High-Field, High-Frequency ESR in the One-Dimensional Quantum Spin Systems"J.Phys. Soc.(Suppl.A). 69. 297-302 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al: "High field ESR in one-dimensional quantum spin systems"Physica B. 284-288. 1625-1626 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajro et al: "mSR Study of 1 : 1 Complex of {Mn(hfac)2} with diazodi(4-pyridyl)methan as a Photoresponsible Magnetic Coupler"Mol. Cryst. Liq. Cryst.. 343. 103-108 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al: "Magnetism of 1D quantum Ferrimagnets, A3Cu3(PO4)4 with A=Ca, Sr"J.Phys. Soc. Jpn.. 70(in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Mekata et al: "Ground state of the geometrically frustrated system Y(Sc)Mn2 studied by muon spin relaxation"Phys. Rev.. B61. 4088-4092 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Nojiri et al et al: "Submillimeter-wave ESR Study on Quantum Spin Systems"J.Phys. Soc. Jpn. (Suppl. B). 69. 83-88 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Keren et al: "Magnetic Dilution in the Geometrically Frustrated SrCr9pGa12-9pO19 and the Role of Local Dynamics : A Muon Spin Relaxation Study"Phys. Rev. Lett.. 84. 3450-3453 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Asano et al: "ESR Investigation on the Breather Mode and the Spinon-Breather Dynamical Crossover in Cu Benzoate"Phys. Rev. Lett.. 84. 5880-5883 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kikuchi et al: "Susceptibility and high-field magnetization of one dimensional S=1/2 Heisenberg antiferromagnet with next-nearest exchange interaction"Physica B.. 284-288. 1631-1632 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Asano et al: "High-Field Magnetization Process in Free Radical and Metal-Assembled Molecular Magnet"Mol. Cryst. Liq. Cryst.. 343. 109-114 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Inagaki et al: "High-Field Magnetization and High-Frequency ESR Study on the Tetranulear Cluster Composed of pi-Electrons(S=1/2)and d-Electrons (S=5/2)"Mol. Cryst. Liq. Cryst.. 343. 115-120 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Fukita et al: "Trinuclear Cu(II)M(II)Cu(II) complexes of an oxamide/dioxime ligand and extension to a bimetallic magnetic compound"J.Chem. Soc., Dalton Trans.. 64-70 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Koike et al: "Neutron Scattering Study of the Field Induced Antiferromagnets Order and Magnetic Excitation in Linear Chain Haldane Compound"J.Phys. Soc. Jpn.. 70(in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Inagaki et al: "Successive Phase Transition of Singlet Ground State System Cs3Cr2Cl9 under External Magneiic .Field up to 40T"Proceedings of the 4th Int. Symposium on Advanced Physical Fields. 239-242 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Kikuchi et al: "High Field Magnetization of S=1 Antiferromagnets with Bond Alternation"Proceedings of the 4th Int. Symposium on Advanced Physical Fields..

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Ajiro et al.: "High-Field, High-Frequency ESR in the One-Dimensional Quantum Spin Systems"J.Phys.Soc.Jpn.(Suppl.A). 69. 297-302 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Ajiro et al.: "High field ESR in one-dimensional quantum spin systems"Physica B. 284-288. 1625-1626 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Ajiro et al.: "mSR Study of 1:1 Complex of {Mn(hfac)2} with diazodi (4-pyridyl) methan as a Photoresponsible Magnetic Coupler"Mol.Cryst.Liq.Cryst.. 343. 103-108 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Ajiro et al.: "Magnetism of 1D quantum Ferrimagnets, A3Cu3(PO4)4 with A=Ca, Sr"J.Phys.Soc.Jpn.. 70(in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Mekata et al.: "Ground state of the geometrically frustrated system Y(Sc) Mn2 studied by muon spin relaxation"Phys.Rev.. B61. 4088-4092 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Nojiri et al.: "Submillimeter-wave ESR Study on Quantum Spin Systems"J.Phys.Soc.Jpn.(Suppl.B). 69. 83-88 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Keren et al.: "Magnetic Dilution in the Geometrically Frustrated SrCr9pGa12-9pO19 and the Role of Local Dynamics : A Muon Spin Relaxation Study"Phys.Rev.Lett.. 84. 3450-3453 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Asano et al.: "ESR Investigation on the Breather Mode and the Spinon-Breather Dynamical Crossover in Cu Benzoate"Phys.Rev.Lett.. 84. 5880-5883 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Kikuchi et al.: "Susceptibility and high-field magnetization of one dimensional S=1/2 Heisenberg antiferromagnet with next-nearest exchange interaction"Physica B. 284-288. 1631-1632 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Asano et al.: "High-Field Magnetization Process in Free Radical and Metal-Assembled Molecular magnet"Mol.Cryst.Liq.Cryst.. 343. 109-114 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Inagaki et al.: "High-Field Magnetization and High-Frequency ESR Study on the Tetranuclear Cluster Composed of pi-Electrons(S=1/2) and d-Electrons (S=5/2)"Mol.Cryst.Liq.Cryst.. 343. 115-120 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Fukita et al.: "Trinuclear Cu (II) M (II) Cu (II) complexes of an oxamide/dioxime ligand and extension to a bimetallic magnetic compound "J.Chem.Soc.,Dalton Trans.. 64-70 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.B.Jamali et al.: "Alloying Effects on Intermolecular Magnetic ・ ・ ・"Mol. Cryst. and Liq. Cryst.. 333. 121-130 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Ajiro et al.: "High field ESR in one-dimensional quantum spin systems"Phyica B. (in press.). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Ajiro et al.: "High-Field,High-Frequency ESR in the 1D ・ ・ ・"Suppl.J.Phys.Soc.Jpn.. (in press.). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Ajiro et al.: "μSR Study of 1:1 Complex of {Mn(hfac)_2} with ・ ・ ・"Mol. Cryst. and Liq.Cryst.. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Asano et al.: "High-Field Magnetization Process in free Redical ・ ・ ・"Mol. Cryst. and Liq.Cryst.. (in press.). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Inagaki et al.: "High-Field Magnetization and High-Frequency ESRMol. Cryst. and Liq.Cryst."Mol. Cryst. and Liq.Cryst.. (in press.). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Mekata et al.: "Ground state of the geometrically frustrated system ・ ・ ・"Phys. Rev.. B61. 4088-4092 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Asano et al.: "ESR investigation on the Breather mode ・ ・ ・"Phys. Rev.Lett.. (in press.). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] A.Keren et al.: "Magnetic dilution in the geometrically frustrated ・ ・ ・"Phys. Rev.Lett.. (in press.). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2020-05-15  

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