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

Tadashi Kawamoto, Takehiko Mori, Yohji Misaki, Kazuya Kawakami, Hideki Fujiwara, Tokio Yamabe, Hatsumi Mori, Shoji Tanaka

doi:10.1080/10587259608037928

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

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

説明

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.