Electronic state anisotropy and the Fermi surface topology of the incommensurate organic superconducting crystal (MDT-TSF)(AuI\(\mathsf{_2}\)) \(\mathsf{_{0.436}}\)

  • T. KawamotoEmail author
  • T. Mori
  • C. Terakura
  • T. Terashima
  • S. Uji
  • H. Tajima
  • K. Takimiya
  • Y. Aso
  • T. Otsubo


The Fermi surface (FS) shape of the organic superconductor (MDT-TSF)(AuI2)0.436 with an incommensurate anion structure (MDT-TSF: methylenedithio-tetraselenafulvalene) has been investigated by means of the optical reflectance spectra and angular-dependent magnetoresistance oscillations (AMRO). The difference of the plasma frequencies between the interstack and the intrastack directions indicates that the overall band structure has small anisotropy (\(\omega_{p,\perp} / \omega_{p,\parallel} \approx 0.62\)). The observation of the AMRO shows the presence of a small closed orbit, which can be assigned to the overlapped area of the large FS. This demonstrates that the incommensurate anion potential is crucial to remove the degeneracy of the energy bands on the zone boundary. The magnetoresistance peak in the fields applied within the conducting layers shows an unusually large interlayer transfer integral (\(t_{\perp} \approx 1\) meV) among organic superconductors.


Fermi Surface Zone Boundary Conducting Layer Closed Orbit Surface Topology 
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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • T. Kawamoto
    • 1
    Email author
  • T. Mori
    • 1
  • C. Terakura
    • 2
  • T. Terashima
    • 2
  • S. Uji
    • 2
  • H. Tajima
    • 3
  • K. Takimiya
    • 4
  • Y. Aso
    • 4
  • T. Otsubo
    • 4
  1. 1.Department of Organic and Polymeric Materials, Graduate School of Science and EngineeringTokyo Institute of TechnologyTokyoJapan
  2. 2.National Institute for Materials ScienceIbarakiJapan
  3. 3.Institute for Solid State PhysicsThe University of TokyoChibaJapan
  4. 4.Department of Applied Chemistry, Graduate School of EngineeringHiroshima UniversityHiroshimaJapan

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