Disorder effect on the vortex pinning by the cooling-process control in the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

Naoki Yoneyama, Takahiko Sasaki, Terukazu Nishizaki, Norio Kobayashi

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23 Citations (Scopus)


We investigate the influence of disorders in terminal ethylene groups of BEDT-TTF molecules (ethylene-disorders) on the vortex pinning of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. Magnetization measurements are performed under different cooling-processes. The second peak in the magnetization hysteresis curve is observed for all samples studied, and the hysteresis width of the magnetization becomes narrower by cooling faster. In contradiction to the simple pinning effect of disorder, this result shows the suppression of the vortex pinning force by introducing more ethylene-disorders. The ethylene-disorder domain model is proposed for explaining the observed result. In the case of the system containing a moderate number of the ethylene-disorders, the disordered molecules form a domain structure and it works as an effective pinning site. On the contrary, an excess number of the ethylene-disorders may weaken the effect of the domain structure, which results in the less effective pinning force on the vortices.

Original languageEnglish
Pages (from-to)184-189
Number of pages6
JournalJournal of the Physical Society of Japan
Issue number1
Publication statusPublished - 2004 Jan


  • Cooling rate
  • Dimensional crossover
  • Disorder
  • Domain
  • Ethylene group
  • Magnetization
  • Organic superconductor
  • Vortex pinning


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