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Syntheses and Properties of Organic Ferroelectrics Based on Strong Electron-Lattice Interaction

Research Project

Project/Area Number 63460030
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionUniversity of Tokyo

Principal Investigator

TOKURA Yoshinori  University of Tokyo, Department of Physics, Assistant Professor, 理学部, 助教授 (30143382)

Co-Investigator(Kenkyū-buntansha) KOSHIHARA Shin-ya  University of Tokyo, Department of Physics, Research Associate, 理学部, 助手 (10192056)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1989: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1988: ¥4,200,000 (Direct Cost: ¥4,200,000)
Keywordslow-dimensional ferroelectricity / Organic pi-molecule / Charge-transfer compounds / hydrogen bonded solids / Spin-lattice interaction / domain-walls / Soliton / photo-electric / ドメイン注入 / 光伝導 / 有機強誘電体 / ソリトン / 1次元強誘電性
Research Abstract

In this study, we have proposed new ideas for organic pi-molecular solids with low-dimensional ferroelectricity. The key to get the molecular ferroelectrics is to utilize the strong pi-electron-lattice interaction characteristic of the one-dimensional(lD) system which can promote the phase transition to the polar structure below finite temperature (T_c). Here, the "lattice" means , for example, the molecular stack in the charge-transfer(CT) compounds with s=1/2 spins, the molecular moiety showing the planar-nonplanar transition and the hydrogen-bonding chains between pi-molecules. We have studied two typical examples which show such a 1D ferroelectricity with dynamical domain-walls; (1) ionic donor(D)-acceptor(A) charge-transfer compounds with the bond-ordered-wave (BOW) type stack dimerization and (2) hydrogen bonded solids consisting of enol-form -molecules with the -C=O and =C-OH groups.
In the former systems, the spin-lattice interaction causes the polar BOW states (D^+A^-D^+A^-D^+A^- or A^-D^+A^-D^+A^-D^+), which show the 3D ordering below T^c. On the other hand, in the hydrogen bonded pi- molecular solids the bond alternation pattern within the molecule is governed by the position of proton in-between the neighboring molecules (O=C-C=C-OH..O=C-C=C-OH..O=C-C=C-OH.. or HO-C=C-C=O..HO-C=C-C=O..HO-C=C-C=OH..). It was shown in both cases, the mobile kink-type domain-walls (or solitons) do exist between the two degenerate structures with opposite pi-electron polarization. We have obtained experimental results indicating such charge- and/or spin-carrying domain-walls play a crucial role in dielectric and photo-electric properties in those new dielectrics.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] H.Okamoto,T.Mitani,Y.Tokura,S.Koshihara,T.Komatsu,Y.Iwasa,T.Koda and G.Saito: "Anomalous dielectric response in tetrathiafulvalene-p-chloranil as observed in temperature and pressure-induced neutral-to-ionic phase transition" Phys.Rev.B in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Tokura,S.Koshihara,Y.Iwasa,H.Okamoto,T.Komatsu,T.Koda,N.Iwasawa and G.Saito: "Domain-wall dynamics in organic charge-transfer compounds with one-demensional ferroelectricity" Phys.Rev.Lett.63. 2405-2408 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Iwasa,T.Koda,Y.Tokura,S.Koshihara,N.Iwasawa and G.Saito: "Switching effect in organic charge transfer complex crystals" Appl.Phys.Lett.55. 2111-2113 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Iwasa,T.Koda,S.Koshihara,Y.Tokura,N.Iwasawa and G.Saito: "Intrinsic negative resistance effect in mixed-stack charge transfer crystals"," Phys.Rev.B. 39. 10441-10443 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Tokura,H.Okamoto,T.Koda,T.Mitani,and G.Saito: "Nonlinear electronic transport and switching phenomenon in the mixed-stack charge-transfer crystal TTF-p-shloranil" Phys.Rev.B. 38. 2215-2217 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Okamoto,T.Komatsu,Y.Iwasa,T.Koda,Y.Tokura,S.Koshihara,T.Mitani,and G.Saito: "Dynamical aspects of neutral-ionic phase transition in organic charge-transfer complex crystals"" Synthetic Metals. 27. B189-B192 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Okamoto, T.Mitani, Y.Tokura, S.Koshihara, T.Komatsu, Y.Iwasa, T.Koda and G.Saito: "Anomalous dielectric response in tetrathiafulvalene-p-chloranil as observed in temperature and pressure-induced neutral-to-ionic phase transition" Phys.Rev.B.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Tokura, S.Koshihara, Y.Iwasa, H.Okamoto, T.Komatsu, T.Koda, N.Iwasawa and G.Saito: "Domain-wall dynamics in organic charge-transfer compounds with one-dimensional ferroelectricity" Phys.Rev.Lett.63 2405-2408 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Iwasa, T.Koda, Y.Tokura, S.Koshihara, N.Iwasawa and G.Saito: "Switching effect in organic charge transfer complex crystals" Appl.Phys.Lett.55 2111-2113 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Iwasa, T.Koda, S.Koshihara, Y.Tokura, N.Iwasawa and G.Saito: "Intrinsic negative resistance effect in mixed-stack charge transfer crystals" Phys. Rev.B 39 10441-10443 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.Tokura, H.Okamoto, T.Koda, T.Mitani and G.Saito: "Nonlinear electronic transport and switching phenomenon in the mixed-stack charge-transfer crystal TTF-p-chloranil" Phys.Rev.B 38 2215-2217 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Okamoto, T.Komatsu, Y.Iwasa, T.Koda, Y.Tokura, S.Koshihara, T.Mitani and G.Saito: "Dynamical aspects of neutral-ionic phase transition in organic charge-transfer complex crystals" Synthetic Metals 27 B189-192 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.Okamoto,T.Mitani,Y.Tokura,S.Koshihara,T.Komatsu,Y.Iwasa,T.Koda and G.Saito: "“Anomalous dielectric response in tetrathiafulvalene-p-chloranil as observed in temperature and pressure-induced neutral-to-ionic phase transition"" Phys.Rev.B.

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Tokura,S.Koshihara,Y.Iwasa,H.Okamoto T.Komatsu,T.Koda,N.Iwasawa and G.Saito: "“Domain-wall dynamics in organic charge-transfer compounds with one-dimensional ferroelectricity"" Phys.Rev.Lett.63. 2405-2408 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Iwasa,T.Koda,Y.Tokura,S.Koshihara,N.Iwasawa and G.Saito: "“Switching effect in organic charge transfer complex crystals"" Appl.Phys.Lett.55. 2111-2113 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Iwasa,T.Koda,S.Koshihara,Y.Tokura N.Iwasawa and G.Saito: "“Intrinsic negative resistance effect in mixed-stack charge transfer crystals"" Phys.Rev.B. 39. 10441-10443 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Mitani;Y.Kaneko;S.Tanuma;Y.Tokura;T.Koda;G.Saito: Phys.Rev.B. 35. 427-429 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.Mitani;V.Tokura;Y.Kaneko;K.Takaoka;T.Koda;G.Saito: Synthetic Metals. 19. 515-520 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Tokura;H.Okamoto;T.Koda;T.Mitani;G.Saito: Phys.Rev.B. 38. 2215-2218 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] H.Okamoto;T.Komatusu;Y.Iwasa;T.Koda;Y.Tokura;S.Koshihara;T.Mitani;G.Saito: Snthetic Metals. 27. B189-B196 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] H.Okamoto;T.Koda;Y.Tokura;T.Mitani;G.Saito: Phys.Rev.B.

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Iwasa;T.Koda;S.Koshihara;Y.Tokura;N.Iwasawa;G.Saito: Phys.Rev.B.

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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