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Dynamics of electrical conductions for the materials confined in continuous nano-space

Research Project

Project/Area Number 15201019
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Nanostructural science
Research InstitutionTohoku University

Principal Investigator

TOYOTA Naoki  Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (50124607)

Co-Investigator(Kenkyū-buntansha) KURODA Noritaka  Kumamoto University, Department of Mechanical Engineering and Materials Science, Professor, 工学部, 教授 (40005963)
MATSUI Hiroshi  Tohoku University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (30275292)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥48,490,000 (Direct Cost: ¥37,300,000、Indirect Cost: ¥11,190,000)
Fiscal Year 2004: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2003: ¥40,430,000 (Direct Cost: ¥31,100,000、Indirect Cost: ¥9,330,000)
Keywordsmesoporous / zeolite / nanowire / terahertz / complex conductivity / dynamics / low-dimensional / ナノ多孔体 / 電気伝導体 / カーボンナノチューブ / 人工配列したDNA
Research Abstract

In the mesoporous carbon CMK systems, there exist a wide variety of structures. We have carried out the measurements on the electrical conductivities and magnetic susceptibilities in these CMK systems. As a result, we have clarified that low-temperature conducting properties are caused by a two-dimensional variable range hopping mechanism. Under zero-field cooling, the magnetic susceptibility takes a maximum in the vicinity of 60K though, under field cooling, the susceptibilities only exhibit an increase. These facts indicate a formation of spin-glass states in these mesoporous carbon systems. We expect that the spin originates from non-bonding π-electrons in graphen sheets composing the mesoporous structure.
In order to detect dynamical properties of low-dimensional electronic systems, we have realized spectroscopic measurement in the range of terahertz frequency. We employ the transmission measurement based on time-domain spectroscopy. The frequency dependence of complex conductivity and complex dielectric constant are determined from 0.1 to 2 THz. Since we have much interests in the low temperature dynamics, the optical cryostat has been installed in the terahertz unit. Now the minimum measuring temperature is achieved to be 2 K. With use of the terahertz spectrometer, we have measured niobium films, self-organizing DNA films and various mesoporous systems to obtain high-frequency dynamics.
In addition, the microwave conductivity and infrared spectra were measured for artificially synthesized dry DNA crystals. We have found the importance of the role of primary hydration even in the dry DNA systems.

Report

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

    (31 results)

All 2005 2004 2003 Other

All Journal Article (11 results) Book (2 results) Publications (18 results)

  • [Journal Article] Dielectric ordering and colossal magnetodielectricity in the antiferromagnetic insulating state of λ-(BEDT-TSF)2FeCl42005

    • Author(s)
      N.Toyota, H.Matsui, et al.
    • Journal Title

      Phys.Rev.B 71

      Pages: 12416-12416

    • NAID

      120000775632

    • 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] High-pressure infrared absorption in Cs_2TCNQ_3 crystals grown undermagnetic field2005

    • Author(s)
      N.Toyota, Kuroda, et al.
    • Journal Title

      Synth.Met. 148

      Pages: 307-31

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] High-pressure infrared absorption in Cs_2TCNQ_3 crystals grown under magnetic field2005

    • Author(s)
      N.Kuroda, et al.
    • Journal Title

      Synth.Met. 148

      Pages: 307-312

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Low frequency dielectric properties in a ferromagnetic semiconductor (ED-TTFVO) 2FeBr4 with permanent electric dipoles2004

    • Author(s)
      N.Toyota et al.
    • Journal Title

      J.Phys.IV France 114

      Pages: 125-126

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic response of microwave complex conductivities in antiferromagnetic insulating states of λ-(BEDT-TSF)2FeCl42004

    • Author(s)
      N.Toyota, H.Matsui, et al.
    • Journal Title

      J.Phys.IV France 114

      Pages: 233-237

    • 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] Relaxor-like behavior in λ-(BETS)_2FeCl_4 studied by SR X-ray diffraction2004

    • Author(s)
      N.Toyota et al.
    • Journal Title

      J.Phys.Soc.Jpn. 73

      Pages: 2385-2388

    • NAID

      110001954989

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Low frequency dielectric properties in a ferromagnetic semiconductor (ED-TTFVO)2FeBr4 with permanent electric dipoles2004

    • Author(s)
      N.Toyota et al.
    • Journal Title

      J.Phys.IV France 114

      Pages: 125-126

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Relaxor-like behavior in λ-(BETS)_2FeCl_4 studied by SR X-ray diffraction2004

    • Author(s)
      N.Toyota, et al.
    • Journal Title

      J.Phys.Soc.Jpn. 73

      Pages: 2385-2388

    • NAID

      110001954989

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Low frequency dielectric properties in a ferromagnetic semiconductor(ED-TTFVO)2FeBr4 with permanent electric dipoles2004

    • Author(s)
      N.Toyota et al.
    • Journal Title

      J.Phys.IV France 114

      Pages: 125-126

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Magnetic field effects on nonlinear electrical transport in λ-(BEDT-TSF)_2 FeCl_4 where BEDT-TSF is bis(ethylenedithio)tetraselenafulvalene2003

    • Author(s)
      N.Toyota, H.Matsui, et al.
    • Journal Title

      J.Phys.Soc.Jpn. 72

      Pages: 2714-2717

    • NAID

      110001954293

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetic field effects on nonlinear electrical transport in λ-(BEDT-TSF)_2FeCl_4 where BEDT-TSF is bis(ethylenedithio)tetras elenafulvalene2003

    • Author(s)
      N.Toyota, H.Matsui, et al.
    • Journal Title

      J.Phys.Soc.Jpn. 72

      Pages: 2714-2717

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Book] 第5版実験化学講座「電気物性、磁気物性」3.5章高周波伝導率測定2004

    • Author(s)
      松井広志, 豊田直樹
    • Total Pages
      9
    • Publisher
      丸善
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Book] The fifth series of experimental chemistry Vol.7, Chap.3.52004

    • Author(s)
      H.Matsui, N.Toyota
    • Publisher
      Maruzen
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Takagi S, Matsui H, Toyota N, et al.: "Enhancement of the H-1 NMR relaxation rate at low temperatures and development of antiferromagnetic spin fluctuations of pi-electrons in superconducting lambda-(BETS)(2)GaCl4"J PHYS SOC JPN. 72・12. 3259-3265 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Toyota N, Matsui H, et al.: "Magnetic field effects on nonlinear electrical transport in lambda-(BEDT-TSF)(2)FeCl4, where BEDT-TSF is bis(ethylenedithio)tetraselenafulvalene"J PHYS SOC JPN. 72・11. 2714-2717 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Matsui H, Toyota N, et al.: "Relaxor ferroelectric behavior and collective modes in the pi-d correlated anomalous metal lambda-(BEDT-TSF)(2)FeCl4"PHYS REV B. 68・15. 155105 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Pratt FL, Matsui H, Toyota N, et al.: "mu SR studies of magnetic superconductors based on the BETS molecule"POLYHEDRON. 22・14-17. 2307-2310 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Abe Y, Matsui H, Toyota N, et al.: "Nonlinear electrical transport in lambda-(BEDT-TSF)(2)FeCl4 under magnetic field"SYNTHETIC MET. 135・1-3. 565-566 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Suzuki T, Matsui H, Toyota N, et al.: "Antiferromagnetic resonance in lambda-(BEDT-TSF)(2)FeCl4"SYNTHETIC MET. 135・1-3. 567-568 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Matsui H, Toyota N, et al.: "Anisotropic microwave complex conductivities in lambda-(BEDT-TSF)(2)FeCl4"SYNTHETIC MET. 135・1-3. 569-570 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kuno M, Matsui H, Terasaki O, Ryoo R, Toyota N, et al.: "Magnetic susceptibility and electrical resistivity of a mesoporous carbon CMK-1"SYNTHETIC MET. 135・1-3. 721-722 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takagi S, Toyota N, et al.: "NMR evidence for antiferromagnetic spin fluctuations in superconducting lambda-(BETS)(2)GaCl4"SYNTHETIC MET. 137・1-3. 1297-1298 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Ishizaki Y, Matsui H, Toyota N, et al.: "Specific heat of organic superconductor lambda-(BEDT-TSF)(2)GaCl4"SYNTHETIC MET. 133. 219-220 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Matsumoto T, Toyota N, et al.: "Crystal structures and conducting/magnetic properties in two different crystals of (ethylene dithiotetrathiafulvalenoquinone-1,3-dithiolemethide)(2)center dot MBr4 (M=Fe, Ga)"SYNTHETIC MET. 133. 333-335 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Pratt FL, Toyota N, et al.: "mu SR studies of the interaction between magnetism and superconductivity in kappa-BETS2FeCl4"SYNTHETIC MET. 133. 489-492 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Toyota N, Matsui H, et al.: "A dielectric metal lambda-(BEDT-TSF)(2)FeCl4"SYNTHETIC MET. 133. 493-495 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kuroda N, H, Toyota N, et al.: "Electronic properties of Cs(2)TCNQ(3) crystals grown under magnetic field"SYNTHETIC MET. 133. 535-537 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Negishi E, Matsui H, Toyota N, et al.: "Specific heat studies for lambda-(BEDT-TSF)(2)FeCl4"SYNTHETIC MET. 133. 555-556 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Endo S, Matsui H, Toyota N, et al.: "Metal-insulator transitions in magnetic conductor lambda-(BEDT-TSF)(2)FeCl4 studied by H-1 and Se-77 NMR"SYNTHETIC MET. 133. 557-558 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Matsui H, Toyota N, et al.: "Dielectric response in the metallic states of lambda-(BEDT-TSF)(2)FeCl4"SYNTHETIC MET. 133. 559-560 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tsuchiya H, Matsui H, Toyota N, et al.: "Microwave response in the antiferromagnetic insulating states of lambda-(BEDT-TSF)(2)FeCl4"SYNTHETIC MET. 133. 561-562 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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