Metal–Insulator Transition of the New One-Dimensional Organic Conductors with Complete Uniform Stacks: (DMEDO-TTF)<sub>2</sub><i>X</i>(<i>X</i>= ClO<sub>4</sub>and BF<sub>4</sub>)

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  • Shohei Kumeta
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
  • Tadashi Kawamoto
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
  • Takashi Shirahata
    Department of Applied Chemistry, Ehime University, Matsuyama 790-8577, Japan
  • Yohji Misaki
    Department of Applied Chemistry, Ehime University, Matsuyama 790-8577, Japan
  • Takehiko Mori
    Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan

Description

The structural, transport, and magnetic properties of the new organic conductors (DMEDO-TTF)2X (X = ClO4 and BF4), where DMEDO-TTF is dimethyl(ethylenedioxy)tetrathiafulvalene, have been investigated. These compounds have a complete uniform stack structure, indicating that a quasi-one-dimensional 3/4-filled band without a dimerization gap is realized. The ClO4 and BF4 salts show a first-order metal–insulator (MI) transition at approximately 190 and 210 K, respectively, in the cooling process. The ground state is a nonmagnetic insulator on the basis of magnetic susceptibility measurements. Low-temperature X-ray diffraction measurements show that the MI transition originates in the anion ordering transition with a superstructure wave vector of \(\boldsymbol{{q}} = (0,1/2,0)\) corresponding to the stacking direction; the uniform donor stacking structure changes to the tetramerized structure with a large shift of the donors. The shift of the anion toward the central two donors in a tetramer indicates that the...

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