Critical Field Anisotropy in “2K-Superconducting State” of Organic Superconductor β-(BEDT-TTF) 2 I 3

Takahiko Sasaki, Naoki Toyota, Masahiko Hasumi, Toshihito Osada, Seiichi Kagoshima, Hiroyuki Anzai, Madoka Tokumoto, Nobumori Kinoshita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The anisotropy of the upper critical field H c2 has been measured at ambient pressure on a layered organic superconductor β-(BEDT-TTF) 2 I 3 both in the states before and after annealing at 109 K for 120 hours. By annealing, the critical temperature T c increases from 1.4 to 2.08 K, while the H c2±plane increases and the anisotropy, H c2//plane /H c2±Plane , decreases. The angular dependences of H c2 for both states are explained in terms of the effective mass model. It is clarified that the enhanced T c which is ascribed to the annealing-induced configurational orderings of ethylene groups is closely related to the enhanced effective mass in the basal plane.

Original languageEnglish
Pages (from-to)3477-3480
Number of pages4
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 1989 Jan 1


  • Critical field anisotropy
  • β(BEDT-TTF) I

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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