Conductivity of Radical-Cation Salts of TTP Series Donors under High Pressure

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  • Tadashi Kawamoto
    a Department Of Organic And Polymeric Materials , Tokyo Insitute Of Technology , O-Okayama, Tokyo , 152 , Japan
  • Takehiko Mori
    a Department Of Organic And Polymeric Materials , Tokyo Insitute Of Technology , O-Okayama, Tokyo , 152 , Japan
  • Yohji Misaki
    b Division of molecular Engineering , Kyoto University , Yoshida, Kyoto , 606-01 , Japan
  • Kazuya Kawakami
    b Division of molecular Engineering , Kyoto University , Yoshida, Kyoto , 606-01 , Japan
  • Hideki Fujiwara
    b Division of molecular Engineering , Kyoto University , Yoshida, Kyoto , 606-01 , Japan
  • Tokio Yamabe
    b Division of molecular Engineering , Kyoto University , Yoshida, Kyoto , 606-01 , Japan
  • Hatsumi Mori
    c International Superconductivity Technology Center , Shinonome, Tokyo , 135 , Japan
  • Shoji Tanaka
    c International Superconductivity Technology Center , Shinonome, Tokyo , 135 , Japan

Description

Abstract Anomalous conducting behavior in TTP series salts, particularly (CPTM-TTP)4PF6, where CPTM-TTP is 2-(4,5-cyclopenteno-1,3-dithiol-2-ylidene)-5-(4,5-dimethylthio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene, has been investigated in detail. This charge-transfer salt shows resistivity jumps around 100K, but is still metallic at low temperatures. These jumps are suppressed under applied pressures. Below 30K several sudden drops of resistivity like superconducting transitions are observed, but are not affected by magnetic fields. This anomalous behavior is discussed in view of hysteretic transitions between two metallic phases.

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