ESR Investigation of Organic Conductors (DTM-TTP)(TCNQ)(TCE) and (TMET-TTP)2(TCNQ).

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  • Hoshino Hirotada
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Tokyo 152–8552
  • Aragaki Masanobu
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Tokyo 152–8552
  • Murata Kyoji
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Tokyo 152–8552
  • Kawamoto Tadashi
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Tokyo 152–8552
  • Mori Takehiko
    Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O–okayama, Tokyo 152–8552
  • 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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  • ESR Investigation of Organic Conductors (DTM-TTP)(TCNQ)(TCE) and (TMET-TTP)<sub><b>2</b></sub>(TCNQ)

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Magnetic properties of the title compounds are investigated by ESR measurements, and from the temperature dependence of the g-values, the spin susceptibility is separated into donor and TCNQ contributions. For (DTM-TTP)(TCNQ)(TCE), the overall spin susceptibility decreases gradually from room temperature to 200 K, and more rapidly below 200 K, indicating a gradual crossover from a metallic to nonmagnetic insulating state. For (TMET-TTP)2(TCNQ), the spin susceptibility exhibits a gradual increase from room temperature to 50 K, followed by a rapid Curie-like increase that is attributed to the isolated TCNQ molecules. The donors remain paramagnetic even in the insulating state in accordance with the two-dimensional θ-type arrangement of the donor conducting sheet.

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