Thermally activated flux flow in FeSe0.5Te0.5 superconducting single crystal

R. M. Hamad, T. S. Kayed, S. Kunwar, Kh A. Ziq

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The current-voltage (J-E) isotherms of single crystal FeSe0.5Te0.5 sample have been measured at several temperatures near the transition temperature (Tc) and under applied magnetic fields (H). A power law (E ∼ Jβ ) has been used to fit the data and evaluate the activation energy Uo (T) using β = Uo/kBT. At low current density (J << Jc), the initial behaviour is associated with thermally activated flux Flow (TAFF) while at J >> Jc vortex flux flow (FF) behavior is expected. The effects of applied magnetic field on FF and TAFF also been investigated. We found that Uo(FF) was reduced with by about an order of magnitude in magnetic fields as low as ∼1.5 Tesla-the reduction in Uo(TAFF) is even faster than in Uo(FF)-hence reflecting the low pinning nature (defects, vacancies etc.) of FeSe0.5Te0.5 superconductor.

Original languageEnglish
Article number012034
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 11 Jul 2017

Bibliographical note

Publisher Copyright:
© Published under licence by IOP Publishing Ltd.

ASJC Scopus subject areas

  • General Physics and Astronomy


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