First-order vortex phase transition in κ-type BEDT-TTF organic superconductors

N. Yoneyama, A. Higashihara, T. Sasaki, N. Kobayashi, S. Yamada

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We measured the local magnetization using a micro-Hall probe in a magnetic field perpendicular to the conduction layer to investigate the mixed state of the quasi-two-dimensional organic superconductors κ-(BEDT-TTF)2Cu(NCS)2. A sharp magnetization jump was observed in the vicinity of the irreversible temperature (Tirr) below ∼ 80 Oe, demonstrating the first-order phase transition. Meanwhile, much broader step structure above higher magnetic field than 80 Oe appears below Tirr. The magnetic field regime of 80-100Oe is likely to be connected with the second peak line in the magnetic field-temperature phase diagram.

Original languageEnglish
Pages (from-to)223-224
Number of pages2
JournalSynthetic Metals
Publication statusPublished - 2003 Mar 13
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: 2001 Sept 102001 Sept 14


  • First-order phase transition
  • Magnetic measurement
  • Organic superconductor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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