Theory of superconductor-insulator transition in organic superconductor λ -(BETS)2FexGa1-xCl4

M. Terao, Y. Ohashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We investigate superconductivity and magnetism in the organic conductor λ-(BETS)2FexGa1-xCl4. In this material, it is known that the d-electrons on Fe-ions are ordered antiferromagnetically (TN<8.5-9 K) for 0.4<x ≤ 1, while superconductivity (TSC<6 K) of π-electrons appears when 0 ≤ x<0.4. In this paper, including the detailed band structure of this material, we discuss the exchange interaction between the d- and π-electrons, focusing on its role in the antiferromagnetism and superconductivity. We show that the inclusion of only this π-d exchange interaction is difficult to explain both the observed x-dependence of TN and TSC. To understand the phase diagram of λ-(BETS)2FexGa 1-xCl4, we point out that the Coulomb interaction between π-electrons is also important.

Original languageEnglish
Pages (from-to)324-328
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberSPEC. ISS.
Publication statusPublished - 2004 Oct 1
Externally publishedYes


  • Magnetism
  • Organic superconductor
  • Superconductor-insulator transition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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