• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Dynamical mechanism orihe ferreclectric transition caused by isotope exchange

Research Project

Project/Area Number 14340086
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionHokkaido University

Principal Investigator

TSUJIMI Yuhji  Hokkaido University, Institute for Electronic Science, Associate Professor, 電子科学研究所, 助教授 (20113673)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥6,600,000 (Direct Cost: ¥6,600,000)
Keywordsquantum paraelectrics / isotope exchange / light scattering experiment / acoustic phonon / optical phonon / SrTi^<18>O_3 / soft mode
Research Abstract

The purpose of this study is to clarify the dynamical mechanism of the appearance of ferroelectricity in SrTi ^<18>O_3(STO18) below T_c=22 K. The Brillouin-Raman scattering, the electric field induced Raman scattering, the hyper Raman scattering, the impulsive stimulated Raman scattering (time-domain measurement), and the dielectric measurement have been performed for this purpose. We finally arrived at the following conclusions. The appearance of ferroelectricity in STO18 comes from the ferroelectric phase transition. The transition is caused basically by the freezing of the ferroelectric E_u soft mode of Slater type. The electric diple-diple interaction in STO18 is almost the same as that in SrTi^<16>O_3 (STO16). Since the E_u soft mode of STO18 has a bigger reduced mass than that of STO16, the quantum fluctuation (zero-point vibration) is suppressed much strongly in STO18 than in STO16. As a consequence, the E_u soft mode can freeze in the case of STO18 and the ferroelectric phase with C_<2v> symmetry appears. The transition is a displacive one, but it is not ideal one (soft mode frequency is not 0 but about 200cm^<-1> at the phase transition temperature T_c). Below T_c, the E_u soft mode splits into two modes ; E_u1 (polarization fluctuation parallel to the spontaneous polarization P_s) and E_u2 (polarization fluctuation perpendicular to P_s).

Report

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

    (32 results)

All Other

All Publications (32 results)

  • [Publications] H.Hasebe: "Brillouin Scattering Study of Ferroelectric SrTi(^<18>O_x^<16>O_<1-x>)_3"Ferroelectrics. 272. 39-44 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yagi: "Isotopically Induced Ferroelectric Phase Transition in SrTi^<18>O_3 Studied by Brillouin and Raman Scattering"Ferroelectrics. 266. 153-163 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yagi: "Brillouin and Raman Scattering Study of the Isotropically Induced Ferroelectric Phase Transition of SrTi^<18>O_3"Physica. B316-317. 596-599 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Yamaguchi: "Brillouin scattering Study of the Broad Doublet in Isotopically Exchanged SrTiO_3"Physical Review. 1365. 172102-1-172102-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Hasebe: "Light Scattering Study in Ferroelectric SrTi^<18>O_3"Ferroelectrics. 285. 27-31 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Watanuki: "Impulsive Stimulated Raman Scattering Study of SrTi(^<18>Ox^<16>O_<1-x>)_3"Ferroelectrics. 285. 33-39 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Minaki: "Hyper-Raman Scattering of SrTi^<18>O_3"Journal of the Korean Physical Society. 42. S1290-S1293 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Hasebe: "Dynamical Mechanism of the Ferroelectric Phase Transition of SrTi^<18O_3 Studied by Light Scattering"Physical Review. 1368. 014109-1-014109-7 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yagi: "Soft-phonon dynamics in The Isotropically Induced Ferroelectric Phase Transition of Strontium Titanate"Materials Research Society. 718. 183-188 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Tsujimi: "A Light Scattering Studies of Soft Mode in SrTi^<18>O_3"Ferroelectrics. (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] T.Watanuki: "Phonon-Polariton Dispersion Relation of SrTi(^<18>O_x^<16>O_<1-x>)_3"Ferroelectrics. (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] H.Hasebe: "Brillouin Scattering Study of Ferroelectric SrTi(^<18>O_X^<16>O_<1-X>)_3"Ferroelectrics. 272. 39-44 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yagi: "Isotropically Induced Ferroelectric Phase Transition in SrTi^<18>O_3 Studied by Brillouin and Rarman Scattering"Ferroelectrics. 266. 153-163 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yagi: "Brillouin and Raman Scattering Study of the Isotopically Induced Ferroelectric Phase Transition of SrTi^<18>O_3"Physica B. 316-317. 596-599 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Yamaguchi: "Briliouin Scattering Study of the Broad Doublet in Isotoically Exchanged SrTiO_3"Physical Review B. 65. 172102 1-172102 4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Hasebe: "Light Scattering Study in Ferrolectic SrTi^<18>O_3"Ferroelectrics. 285. 27-31 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Watanuki: "Impulsive Stimulated Raman Scattering Study of SrTi(^<18>O_x^<16>O_<1-x>)_3"Ferroelectrics. 285. 33-39 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Minaki: "Hyper-Raman Scattering of SrTi^<18>O_3"Journal of the Korean Physical Soceity. 42. S1290-S1293 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Hasebe: "Dynamical Mechanism of the Ferroelectric Phase Transition of SrTi^<18> Studied by Light Scattering"Physical Review B. 68. 014109-1-014109-7 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yagi: "Soft-phonon Dynamics in the Isotropically Induced Ferroelectric Phase Transtion of Strontum Titanate"Materials Research Society. 718. 183-188 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Tsujimi: "Light Scattering Studies of Soft Mode in SrTi^<18>O_3"Ferroelectrics. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Watanuki: "Phonon-Polariton Dispersion Relation of SrTi(^<18>O_x^<16>_<1-x>)_3"Ferroelectrics. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.HASEBE: "Light Scattering Study in Ferroelectic SrTi^<18>O_3"Ferroelectrics. 285. 27-31 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.WATANUKI: "Impulsive stimulated Raman Scattering Study of SrTi(^<18>O_x^<16>O_<1-x>)_3"Ferroelectrics. 285. 33-39 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.MINAKI: "Hyper-Raman Scattering of SrTi^<18>O_3"Journal of the Korean Physical Soceity. 42. S1290-S1293 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.HASEBE: "Dynamical Mechanism of the Ferroelectric Phase Transition of SrTi^<18>O_3 Studied by Light Scattering"Physical Review. B68. 014109-1-014109-7 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.TSUJIMI: "Light Scattering Studies of Soft Mode In SrTi^<18>O_3"Ferroelectrics. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.WATANUKI: "Phonon-Polariton Dispersion Relation of SrTi(^<18>O_x^<16>O_<1-x>)_3"Ferroelectrics. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.HASEBE: "Brillouin Scattering Study of Ferroelectric SrTi(^<18>O_χ^<16>O_<1-χ>)_3"Ferroelectrics. 272. 39-44 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.YAGI: "Isotropically Induced Ferroelectric Phase Transition in SrTi^<18>O_3 Studied by Brillouin and Raman Scattering"Ferroelectrics. 266. 153-163 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.YAGI: "Brillouin and Raman scattering study of the isotopically induced ferroelectric phase transition of SrTi^<18>O_3"Physica B. 316-317. 596-599 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.YAMAGUCHI: "Brillouin Scattering Study of the Broad Doublet in Isotoically Exchanged SrTiO_3"Physical Review B. B65. 172102-1-172102-4 (2002)

    • Related Report
      2002 Annual Research Report

URL: 

Published: 2002-04-01   Modified: 2020-05-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi