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Domain-growth kinetics in the geometrically frustrated isosceles triangular Ising spin system

Research Project

Project/Area Number 14540364
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物性一般(含基礎論)
Research InstitutionTokyo University of Science

Principal Investigator

MITSUDA Setsuo  Faculty of Science, Physics, Associate Proffesor, 理学部・物理学科, 助教授 (90183962)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsSpin frustration / domain growth / neutron scattering / magnetic susceptibility / long-time relaxation / Ising Antiferromagnet / Triangular Lattice / 中性子散乱 / 帯磁率
Research Abstract

We have studied(i)how the power law holds over wide tempetarwe range inAFphase, revealing that the gxnwth exponent n-02 is almost temperature independent and the pie-factor Cis temperature dependent so that C(T)can be fitted to C_0exp(-dE/k_BT)with a kind of activation energy dE/k_B〜10 K and(ii)domain-growth-kineucs in Ferri-magetic phase at H_s=1300 Oe where A'C'-type domain wall is considered to move almost freely and the time evolution of magnetic suscepbblity c' shows power law c'(t)=c'_<eq>+At^n with n〜02.(iii)preserving anomalously low giowdi exponent n〜0.2, anisotropic pinning effect on domain-wall-motion by non-magnetic impunity was clearly observed for the sample with x=0.005. As anisotiopic suppression of domain growth under extemally applied magnetic field in the sample with x=0.00 has been explained, this anisotiopic pinning effect for domain-wail-motion by non-magnetic impurity can be explained by activation energy consideration ; theA/D-type domain wall motion in the b diiection, which is dominated by the stochastic reversal of free magnetic chains due to the isosceles tnangularlauice geomeby of CoNb2O6, is easily disturbed by non-magnetic impurity, while the domain wall motion in the a diiection is not because all sites have finite activation energy.(iiii)only 1% substitution is enough to suppress the domain-growth-kinetics in this system.(In the H_<//c>-T magnetic phase diagram of the sample with x=0.01, as a consequence of suppression of the domain-growth-kinetics, an apparent incommensurate(IC)state, in which thermodynamically equivalent four types of AF domains, A, B, C, D, arrange quasi-regularly along the b axis(likeA/D/C/B/A/D...)with phase shift of π/2, replaces AF state seen in the sample with x=0.00 as low temperature state, maintaining shape of the magnetic phase boundaries.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] S.Mitsuda, H.Okano, S.Kobayashia, K.Prokes: "Non-Magnetic Impurity effect on Domain Growth Kinetics in an isosceles Triangular Ising Antiferomagnet CoNb2O6"J.Magn.&Magn.Mater.. In press. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Terada, S.Mitsuda, K.Prokes, O.Suuki, H.Kitazawa, H.Aruga Katori: "Anomalous Magnetic Excitation on Triangular Lattice Antiferromagnet CuFeO2"J.Magn.&Magn.Mater.. In press. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Kobayashi, H.Okano, T.Jogetsu, J.Miyamoto, S.Mitsuda: "Domain^∧growth kinetics in the isosceles triangular Ising antiferromagnet CoNb2O6"Physical Review B. In press. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Terada, S.Mitsuda, S.Suzuki, K.Kawasaki, M.Fukuda, T.Nagao, H.Aruga Katori: "Disapperance of Quasi-Ising Character in Triangular Lattice Antiferromagnet CuFeO2 by a Small Amount of Substitution"J.Phys.Soc.Jpn. In press. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Mitsuda, H.Okano, S.Kobayashi, K.Prokes: "Non-Magnetic Impurity effect on Domain Growth Kinetics in an isosceles Triangularlsing Antiferomagnet GoNb206"J.Magn.& Magn.Mater.. (In Press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Terada, S.Mitsuda, Y.Oohara, H.Yoshizawa, H.Takei: "Anomalous Magnetic Excitation on Triangular Lattice Antiferromagnet CuFeO2"J.Magn.& Magn.Mater.. (In Press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Kobayashi, K.Okano, T.Jogetsu, J.Miyamoto, S.Mitsuda: "Domain-growth kinetics in the isosceles triangular Ising antiferromagnet CoNb206"Phys.Rev.B.. (In Press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Terada, S.Mitsuda, S.Suzuki, K.Kawasaki, M.Fukuda, T.Nagao, H.Aruga Katori: "Disapperance of Quasi-Ising Character in Triangular Lattice Antiferromagnet CuFeO2 by a Small Amount of Substitution"J.Phys.Soc.Jpn. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Mitsuda, H.Okano, S.Kobayashi, K.Prokes: "Non-Magnetic Impurity effect on Domain Growth Kinetics in an isosceles Triangular Ising Antiferomagnet CoNb2O6"J.Magn.& Magn.Mater.. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] N.Terada, S.Mitsuda, K.Prokes, O.Suzuki, H.Kitazawa, H.Aruga Katori: "Anomalous Magnetic Excitation on Triangular Lattice Antiferromagnet CuFeO2"J.Magn.& Magn.Mater.. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Kobayashi, H.Okano, T.Jogetsu, J.Miyamoto, S.Mitsuda: "Domain^growth kinetics in the isosceles triangular Ising antiferromagnet CoNb2O6"Physical Review B. (In press). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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