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DYNAMICS OF QUANTUM FLUCTUATION STUDIED BY COHERENT PHONON EXCITATION METHOD

Research Project

Project/Area Number 14204029
Research Category

Grant-in-Aid for Scientific Research (A)

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

YAGI Toshirou  Hokkaido University, Research Institute for Electronic Science, Prof., 電子科学研究所, 教授 (30002132)

Co-Investigator(Kenkyū-buntansha) TAKESADA Masaki  Hokkaido University, Grad. School of Sci., Lec., 大学院・理学研究科, 講師 (30311434)
ITOH Mitsuru  Tokyo Institute of Technology, Material and Structures Laboratory, Prof., 応用セラミックス研究所, 教授 (30151541)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥38,480,000 (Direct Cost: ¥29,600,000、Indirect Cost: ¥8,880,000)
Fiscal Year 2004: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2003: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
Fiscal Year 2002: ¥22,100,000 (Direct Cost: ¥17,000,000、Indirect Cost: ¥5,100,000)
Keywordsquantum fluctuations / coherent / soft mode / complete freezing / quantum paraelectrics / inhomogeneity / ferroelectrics / soft phonon / 相転移ダイナミクス / 同位元素誘起強誘電性 / STO / STO18 / FMR
Research Abstract

We concentrated to elucidate the relation between the quantum fluctuations and the macroscopic order in the quantum paraelectric and ferroelectric crystals. The specimen were the quantum paraelectric strontium titanate SrTi^<16>O_3(STO16) and its oxygen isotope exchanged crystal SrTi(^<18>O_x^<16>O_<1-x>)_3(STO18-x), where x=0.23,0.32 and 0.89. The exchange concentration of the oxygen isotope more than 33% (x_c) from ^<16>O to ^<18>O in strontium titanate induces the ferroelectric phase in the typical quantum paraelectric STO16 as discovered by Itch et al.(1999). The spectra of the ferroelectric soft Eu mode in STO16 and STO18-x have been observed in the ultra-low temperature region down to milli-Kelvin. The nominally Raman inactive Eu mode spectra in the centro-symmetric phase were observed as a function of temperature for each of the crystals.
The following two conclusions are obtained ; (1)In STO-89 crystal where the quantum fluctuation is completely depressed by the mass effect of t … More he isotope oxygen, the soft Eu mode can soften completely to zero frequency (complete fireezing) at the ferioelectric phase transition point associated with the less damping vibration than the ordinary other ferroelectrics, where the heavily over-damped spectra of soft mode have been reported as a central peaks. In the case of STO-89, the role of the quantum fluctuations seems to be coherently depression of the damping of the soft mode vibration via the coupling between the soft modes and quantum fluctuations. (2)For the specimen STO-23 and STO-32, the ferroelectric phase transition does not take place because the concentration of both crystals is lower than the critical concentration x_c=0.33. In these crystal, the softening behavior of the Eu mode is confirmed by the observation of the locally symmetry breaking region caused by the inhomogeneity of the concentration of ^<18>O, though it does not show any softening to the zero frequency. In this case, the role of the quantum fluctuation is to prevent the occurrence of the long-range order even in the ultra low temperature region. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (31 results)

All 2005 2004 2001 Other

All Journal Article (15 results) Book (3 results) Publications (13 results)

  • [Journal Article] Growth of Ferroelectric Micro-Regions in SrTiO3 and SrTi (^<18>O_<0.23>^<16>O_<0.77>)_3 Studied by Raman Scattering2005

    • Author(s)
      Hiroki Taniguchi
    • Journal Title

      J.Korean Phys.Soc. 46・1

      Pages: 195-195

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Soft Modes SrTiO_3 Studies by Light-Scattering and Dielectric Measurements2005

    • Author(s)
      Yohei Nakata
    • Journal Title

      J.Korean Phys.Soc. 46・1

      Pages: 93-93

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] ペロフスカイト型量子常誘電性酸化物の巨大な光誘起効果2005

    • Author(s)
      武貞正樹
    • Journal Title

      固体物理 40・2

      Pages: 113-113

    • NAID

      40006606495

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Growth of Ferroelectric Micro-region in SrTiO_3 and SrTi(^<18>O_<0.23>^<16>O_<0.77>)_3 Studied by Raman Scattering.2005

    • Author(s)
      H.Taniguchi, T.Yagi, M.Takesada, M.Itoh
    • Journal Title

      J.Korean Phys.Soc. 46-1

      Pages: 195-195

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Soft Modes SrTiO_3 Studies by Light-Scattering and Dielectric Measurements.2005

    • Author(s)
      Y.Nakata, Y.Tsujimi, T.Yagi, M.Kobayashi, R.Wang, M.Itoh
    • Journal Title

      J.Korean Phys.Soc. 46-1

      Pages: 93-93

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Gigantic Photo-induced Effects in Quantum Paraelectrics Perovskite Oxides.2005

    • Author(s)
      M.Takesada, T.Yagi, M.Itoh, T.Ishikawa, S.Koshihara
    • Journal Title

      Kotaibutsuri 40-2

      Pages: 113-113

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Growth of Ferroelectric Micro-Regions in SrTiO_3 and SrTi(^<18>O_<0.23>^<16>O_<0.77>)_3 Studied by Raman Scattering2005

    • Author(s)
      Hiroki Taniguchi
    • Journal Title

      J.Korean Phys.Soc. 46・1

      Pages: 195-195

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Broad Doublet in SrTiO_32005

    • Author(s)
      Mingqiu Tan
    • Journal Title

      J.Korean Phys.Soc. 46・1

      Pages: 97-97

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effect of Oxygen Isotope Exchange on Ferroelectric Micro-region in SrTiO_3 Studied by Raman Scattering2004

    • Author(s)
      Hiroki Taniguchi
    • Journal Title

      J.Phys.Soc.Jpn. 73・12

      Pages: 3262-3262

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Initial Excitation Process of Ferroelectric B_2 Soft Mode in KD_2PO_42004

    • Author(s)
      Jun Kano
    • Journal Title

      Ferroelectrics 308

      Pages: 17-17

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Phase transition and random-field induced domain walls response in quantum ferroelectrics SrTiO_3 : review and respective2004

    • Author(s)
      Mitsuru Itoh
    • Journal Title

      Science and Technology of Advanced Materials 5

      Pages: 417-417

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of Oxygen Isotope Exchange on Ferroelectric Micro-region in SrTiO_3 Studied by Raman Scattering.2004

    • Author(s)
      H.Taniguchi, M.Takesada, M.Itoh, T.Yagi
    • Journal Title

      J.Phys.Soc.Jpn. 3262

      Pages: 73-12

    • NAID

      110001979292

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Initial Excitation Process of Ferroelectric B_2 Soft Mode in KD_2PO_4.2004

    • Author(s)
      J.Kano, Y.Tsujimi, K.A.Nelson, T.Yagi
    • Journal Title

      Ferroelectrics 308

      Pages: 17-17

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Phase transition and random-field induced domain walls response in quantum ferroelectrics SrTiO_3 : review and respective.2004

    • Author(s)
      M.Itoh, T.Yagi, Y.Uesu, W.Kleemann, R.Blinc
    • Journal Title

      Science and Technology of Advanced Materials 5

      Pages: 417-417

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of Oxygen Isotope Exchange on Ferroelectric Microregion in SrTiO_3 Studied by Raman Scatttering2004

    • Author(s)
      Hiroki Taniguchi
    • Journal Title

      J.Phys.Soc.Jpn. 73・12

      Pages: 3262-3262

    • Related Report
      2004 Annual Research Report
  • [Book] B1 : Inorganic Substances other than : Oxides : SbSI family....TAAP2004

    • Author(s)
      Yoichi Shiozaki
    • Total Pages
      588
    • Publisher
      Springer
    • Related Report
      2004 Annual Research Report
  • [Book] Landolt-Bornstein, Group III : Condensed Matter, Vol.36, Ferroelectric and Related Substances, Al : Oxides, Perovskite-type oxides and LiNbO_3 family2001

    • Author(s)
      Yoichi Shiozaki
    • Total Pages
      588
    • Publisher
      Springer
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Book] Landolt-Bornstein, Group III : Condensed Matter, Vol.36, Ferroelectric and Related Substances, A1 : Oxides, Perovskite-type oxides and LiNbO_3 family (Ed.Y.Shiozaki, E.Nakamura, T.Mitsui)

    • Author(s)
      Y.Shiozaki et al.
    • Publisher
      Springer
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] M.Takesada, T.Yagi, M.Itoh, S.Koshihara: "A Gigantic Photoinduced Dielectric Constant of Quantum Paraelectric Perovskite Oxides Observed under a Weak DC Electric Field"J.Phys.Soc.Jpn.. 72. 1-4 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Takesada, M.Itoh, T.Yagi, S.Koshihara: "Dielectric Enhancement in Quantum Paraelertric SrTiO_3 by UV Laser Irradiation under DC Electric Field"Ferroelectrics. 286. 725-730 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Yagi, J.Kano, T.Watanuki, Y.Tsujimi, K.A.Nelson: "Phase transition dynamics studied by coherent phonon excitation with ultra-short laser pulses"Ferroelectrics. 285. 3-13 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Yagi, J.Kano, T.Watanuki, Y.Tsujimi, K.A.Nelson: "Femtosecond time-resolved spectroscopic study of the slow dynamics in structural phase transition"J.Korean Phys.Soc.. 42. S1012-S1016 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Takesada, T.Yagi, M.Itoh, T.Ishikawa, S.Koshihara: "Photoinduced Phenomena in Quantum Paraelectric Oxides by Ultraviolet Laser Irradiation"Ferroelectrics. (in press).

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Kasahara, T.Yagi: "Raman scattering study of Rb_3D_xH_<1-x>(SO_4)_2"J.Korean Phys.Soc.. 42. S1287-S1293 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Yamaguchi, T.Yagi, Y.Tsujimi, H.Hasebe, R.Wang, M.Itoh: "Light scattering study of the broad doublet in isotopically exchanged SrTi^<18>O_3"Phys. Rev. B. 65・17. 2102-1-2102-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yagi, M.Kasahara, Y.Tsujimi, M.Yamaguchi, H.Hasebe, R.Wang, M.Itoh: "Isotopically 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] M.Kasahara, R.Wang, M.Itoh, T.Yagi: "Soft mode of SrTi^<18>O_<3x>^<16>O_<3(1-x)> studied by Raman scattering"J. Phys. Soc. Jpn.. 71・5. 1254-1256 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yagi, M.Kasahara, Y Tsujimi, M.Yamaguchi, H.Hasebe, R.Wang, M.Itoh: "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] H.Hasebe, Y.Tsujimi, R.Wang, M.Itoh, T.Yagi: "Brillouin scattering study of ferroelectric SrTi(^<18>O_x^<16>O_<1-x>)_3"Ferroelectrics. 272. 39-44 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Kasahara, H.Hasebe, R.Waug, M.Itoh, T.Yagi: "Phase transition of SrTi^<18>O_3 studied with Raman scattering"Ferroelectrics. 272. 15-19 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yagi et al.: "Landolt-Bornstein III/36A2 "Ferroelectrics and Related Substances, Oxides : Oxides other than Perovskite-type and LiNbO_3 family""Springer. 540 (2002)

    • Related Report
      2002 Annual Research Report

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

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