Superconductivity and metal-insulator transition in twin-columnar organic superconductor, (BETS)2(X2TCNQ)[X=Cl, Br]

Ryusuke Kondo, Tatsuo Hasegawa, Tomoyuki Mochida, Seiichi Kagoshima, Yoshihiro Iwasa, Ko Ichi Hiraki, Toshihiro Takahashi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Low-temperature electronic properties of the first all-organic donor-acceptor-type superconducting system, (BETS)2(X2TCNQ) [X=Cl, Br] under high pressure have been investigated by means of resistivity and 1H NMR experiments. The crystal structure of this class of complexes is characterized by a twin-columnar structure of BETS without intra-columnar dimerization at room temperature. Pressure-temperature phase diagrams are established for these compounds, where the electronic ground states are spin-density-wave (SDW's) insulators, except a narrow region of superconducting state in (BETS)2(Cl2TCNQ). A possible unified picture of the electronic states of the title compounds is discussed in terms of hydrostatic pressure effects and chemical substitution ones on them.

Original languageEnglish
Pages (from-to)3023-3030
Number of pages8
JournalJournal of the Physical Society of Japan
Volume70
Issue number10
DOIs
Publication statusPublished - Oct 2001
Externally publishedYes

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organic superconductors
superconductivity
insulators
electronics
metals
pressure effects
dimerization
hydrostatic pressure
phase diagrams
substitutes
nuclear magnetic resonance
electrical resistivity
crystal structure
ground state
room temperature
temperature

Keywords

  • Metal-insulator transition
  • Organic superconductor
  • Superconducting transition

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Superconductivity and metal-insulator transition in twin-columnar organic superconductor, (BETS)2(X2TCNQ)[X=Cl, Br]. / Kondo, Ryusuke; Hasegawa, Tatsuo; Mochida, Tomoyuki; Kagoshima, Seiichi; Iwasa, Yoshihiro; Hiraki, Ko Ichi; Takahashi, Toshihiro.

In: Journal of the Physical Society of Japan, Vol. 70, No. 10, 10.2001, p. 3023-3030.

Research output: Contribution to journalArticle

Kondo, Ryusuke ; Hasegawa, Tatsuo ; Mochida, Tomoyuki ; Kagoshima, Seiichi ; Iwasa, Yoshihiro ; Hiraki, Ko Ichi ; Takahashi, Toshihiro. / Superconductivity and metal-insulator transition in twin-columnar organic superconductor, (BETS)2(X2TCNQ)[X=Cl, Br]. In: Journal of the Physical Society of Japan. 2001 ; Vol. 70, No. 10. pp. 3023-3030.
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AU - Hasegawa, Tatsuo

AU - Mochida, Tomoyuki

AU - Kagoshima, Seiichi

AU - Iwasa, Yoshihiro

AU - Hiraki, Ko Ichi

AU - Takahashi, Toshihiro

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AB - Low-temperature electronic properties of the first all-organic donor-acceptor-type superconducting system, (BETS)2(X2TCNQ) [X=Cl, Br] under high pressure have been investigated by means of resistivity and 1H NMR experiments. The crystal structure of this class of complexes is characterized by a twin-columnar structure of BETS without intra-columnar dimerization at room temperature. Pressure-temperature phase diagrams are established for these compounds, where the electronic ground states are spin-density-wave (SDW's) insulators, except a narrow region of superconducting state in (BETS)2(Cl2TCNQ). A possible unified picture of the electronic states of the title compounds is discussed in terms of hydrostatic pressure effects and chemical substitution ones on them.

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