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Infrared Spectroscopy under high magnetic field and its application to molecular conducto

Research Project

Project/Area Number 10640555
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionThe University of Tokyo

Principal Investigator

TAJIMA Hiroyuki  University of Tokyo, Institute for Solid State Physics, Associate professor, 物性研究所, 助教授 (60207032)

Co-Investigator(Kenkyū-buntansha) HANASAKI Noriaki  University of Tokyo Institute for Solid State physics Research Associate, 物性研究所, 助手 (70292761)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1998: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsreflectance spectra / infrared / far-infrared / molecular conductor / high magnetic field / BEDT-TTF Salts / 分子性伝導体 / 有機伝導体 / 遠赤外分光測定 / 電荷分離
Research Abstract

In this research project, we aim to study optical properties of molecular conductors under high magnetic field. For this purpose, we constructed a new spectrometer and by use of that we have recently succeeded to measure the reflection spectra of a molecular conductor under the magnetic field of 9.6 T in Voigt configuration. This is the first reflectivity measurement under high magnetic field for molecular conductors.
The measurements have been done for θ-(BEDT-TTF)_2CsZn (SCN)_4 (the sample size 0.4 mm×2 mm ; platelet). This salt exhibits metal-insulator transition around 20 K.When the magnetic field is not applied, the reflectance spectra at 8 K are almost the same as those at 25 K.Under the magnetic field of 9.6 T, the reflectivity below 2000 cm^<-1> increases at 25 K, while such increase is negligible at 8 K.We concluded that the increase of reflectivity at 25 K is probably due to the suppression of magnetic fluctuation by the magnetic field.
In connection with the research project, we have done several studies for molecular conductors. Among those, i) estimation of charge-ordering patterns by use of reflection spectra (θ-ET_2MM' (SCN)_4 ; MM'=RbCo, RbZn, CsZn), ii) findings of giant negative magnetoresistance in phtalocyanine compounds, iii) studies on the mid-infrared band in one-dimensional (Me_2DCNQI)_2Li_<l-x>Cu_x salts, are notable.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] T.Yamamoto, H.Tajima, J.Yamaura, S.Aonuma, R.Kato: "Reflectance Spectra and Temperature Dependence of Electrical Resistivity of (Me_2DCNQI)_2Li_<1-x>Cu_x"J.Phys.Soc.Jpn.. 68. 1384-1391 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] N.Hanasaki, H.Tajima, M.Matsuda, T.Naito, T.Inabe: "Giant Negative Magnetoresistance in quasi-one-dimensional conductor TPP[Fe(III)(Pe)(CN)_2]_2 : interplay between local moments and one-dimensional conduction electrons"Phys.Rev.B. 62. 5839-5842 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Matsuda, T.Naito, T.Inabe, N.Hanasaki, H.Tajima 他: "A one-dimensional macrocyclic π-ligand conductor carrying the magnetic center. Structure, electrical, optical and magnetic properties of TPP[Fe(Pc)(CN)2]2 {TPP=tetraphenylphosphonium and [Fe(Pc)(CN)_2]=dicyano (phthalocyaninato)-iron (III))"J.Mater.Chem.. 10. 631-636 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Tajima: "Calculation of Optical Conductivity Spectra of One-dimensional quater-filled molecular conductors on the basis of a mean-field approximation"Solid State Commun.. 113. 279-284 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Yamamoto, H.Tajima, R.Kato: "Magnetic Susceptibility of (DMe-DCNQI)_2Li_<1-x>Cu_x"Solid State Commun.. 114. 281-284 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Tajima, S.Kyoden, H.Mori, S.Tanaka: "Estimation of charge-ordering patterns in θ-ET_2MM'(SCN)_4(MM'=RbCo, RbZn, CsZn) by reflection spectroscopy"Phys.Rev.B. 62. 9378-9385 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Yamamoto, H.Tajima, J.Yamaura, S.Aonuma, R.Kato: "Reflectance Spectra and Temperature Dependence of Electrical Resistivity of (Me_2DCNQI)_2Li_<l-x>Cu_x"J.Phys.Soc.Jpn.. 68. 1384-1391 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Kawamoto, M.Ashizawa, M.Aragaki, T.Mori, T.Yamamoto, H.Tajima, H.Kitagawa, T.Mitani, Y.Misaki, K.Tanaka: "Raman and Optical Investigations on Charge Localization in One-dimensional Organic Conductors, (TTM-TTP)(I_3)_<5/3> and (TSM-TTP)(I_3)_<5/3>"Phys.Rev.B.. 60. 4635-4645 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] N.Hanasaki, H.Tajima, M.Matsuda, T.Naito, T.Inabe: "Giant Negative Magnetoresistance in quasi-one-dimensional conductor TPP[Fe(III)(Pc)(CN)_2]_2 : interplay between local moments and one-dimensional conduction electrons"Phys.Rev.B. 62. 5839-5842 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Matsuda, T.Naito, T.Inabe, N.Hanasaki, H.Tajima, T.Otsuka, K.Awaga, B.Narymbetov, J.Kobayashi: "A one-dimensional macrocyclic π-ligand conductor carrying the magnetic center. Structure, electrical, optical and magnetic properties of TPP[Fe(Pc)(CN)_2]_2 {TPP=tetraphenylphosphonium and [Fe(Pc)(CN)_2]=dicyano (phthalocyaninato)-iron (III)"J.Mater.Chem.. 10. 631-636 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Tajima: "Calculation of Optical Conductivity Spectra of One-dimensional quater-filled molecular conductors on the basis of a mean-field approximation"Solid State Commun.. 113. 279-284 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] N.Hanasaki, H.Tajima, M.Masuda, T.Naito, T.Inabe: "Giant Negative Magnetoresistance in one-dimensional π-d System : TTP[Fe(Pc)(CN)_2]_2 (TTP=tetraphenylphosphonium, Pc=phthalocyanine)"Mol.Cryst.Liq.Cryst.. 343. 41-46 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Yamamoto, H.Tajima, R.Kato: "Magnetic Susceptibility of (DMe-DCNQI)_2Li_<l-x>"Solid State Commun., Solid State Commun. 114. 281-284 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Tajima, S.Kyoden, H.Mori, S.Tanaka: "Estimation of charge-ordering patterns in θ-ET_2MM'(SCN)_4 (MM'=RbCo, RbZn, CsZn) by reflection spectroscopy"Phys.Rev.B. 62. 9378-9385 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Yamamoto et al.: "Reflectance Spectra and Temperature dependence of Electrical Resistivity of (Me_2DCNQI)_2Li_<1-x>Cu_x"J.Phys.Soc.Jpn.. 68. 1381-1391 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Rouziere et al.: "Upper critical field of the molecular superconductor β'-ET_2Me_2P[Pd(dmit)_2]_2"Solid State Commun.. 112. 295-300 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Tajima: "Calculation of Optical Conductivity Spectra of One-dimensional quater-filled molecular conductors on the basis of a mean-field approximation"Solid State Commun.. 113. 279-284 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] N.Hanasaki et al.: "Giant Negative Magnetoresistance in one-dimensional π-d System : TTP[Fe(Pc)(CN)_2]_2 (TTP=tetraphenylphosphonium,Pc=phthalocyanine)"Mol.Cryst.Liq.Cryst.. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Yamamoto et al.: "Magnetic Susceptibility of (DMe-DCNQI)_2Li_<1-x>Cu_x"Solid State Commun.. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Matsuda et al.: "A one-dimensional macrocyclic π-ligand conductor carrying the magnetic center. Structure,electrical,optical and magnetic properties of TPP[Fe(Pc)(CN)_2]_2"J.Mater.Chem.. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] 田島裕之: "実験物理学講座11巻「輸送現象測定」"丸善. 186-197 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Tajima et al: "Pressure-Temperature Phase Diagram of a Molecular Superconducton α-EDT-TTF[N:(dmit)_2]" High Pressure Sci.Technol.7. 532-534 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Yamamoto et al: "Reflectance Spectra and Temperature Dependence of Electrial Resistivity of (Me_2-DCNQI)_2Li_<1-x>Cux" J.Phys.Soc.Jpn.(in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Hanasaki et al: "Hybrid-dimensional System in M(dmit)_2 Salt" Synthetic Metals. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Kyoden: "Physical Properties of (TMET-STF)_2 BF_4" Synthetic Metals. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Tajima: "The study of 4k_FCDW in a One-dimensional System (DMe-DCNQI)_2Li_<1-x> Cux" Synthetic Metals. (in press).

    • Related Report
      1998 Annual Research Report
  • [Publications] J.Yamaura: "Low Temperatune X-ray Study of Phrely One-dimensional Electronic System" Synthetic Metals. (in press).

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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