Marginal Paramagnetic State of a One-Dimensional Half-Filled Alternating Chain in (TTM-TTP)AuI2.

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  • Kawamoto Tadashi
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552
  • Mori Takehiko
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552
  • Yamamoto Takashi
    Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa-shi, Chiba 277-8581
  • Tajima Hiroyuki
    Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa-shi, Chiba 277-8581
  • Misaki Yohji
    Department of Molecular Engineering, Kyoto University, Yoshida, Kyoto 606-8501
  • Tanaka Kazuyoshi
    Department of Molecular Engineering, Kyoto University, Yoshida, Kyoto 606-8501
  • 90155119

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  • Marginal Paramagnetic State of a One-Dimensional Half-Filled Alternating Chain (TTM-TTP)AuI2
  • Marginal Paramagnetic State of a One-Dimensional Half-Filled Alternating Chain in (TTM-TTP)AuI<sub><b>2</b></sub>

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(TTM-TTP)AuI2 (TTM-TTP: 2,5-bis[4,5-bis(methylthio)-1,3-dithiol-2-ylidene]-1,3,4,6-tetra-thiapentalene) has a dimerized structure along the donor stacking direction, and shows semiconducting behavior below room temperature. ESR, static magnetic susceptibility, and optical reflectance of this salt have been measured to investigate the spin state and the electronic correlation. The ESR signal has been observed from room temperature to 3 K, and the spin susceptibility shows paramagnetic behavior with a rapid decrease below 10 K. The static magnetic susceptibility is paramagnetic and has an anomaly around 10 K in agreement with the ESR result. The chain axis optical reflectance spectra show clear optical gap in the mid-infrared region. An attempt is undertaken to analyze the optical spectrum by means of the one-dimensional dimerized Hubbard model, which suggests that the on-site Coulomb repulsion, U, is small and the spin polarization is located at the marginal paramagnetic boundary. These results indicate that this compound is not a band-insulator but the Mott insulator with a small spin gap.

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