Effects of Iron Contents on the Vortex State in FexSe0.5Te0.5

R. M. Hamad, T. S. Kayed, S. Kunwar, K. A. Elsayed, E. Abu-Ruz, Kh A. Ziq*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We investigate the effects of iron content on the upper critical field (Hc2) and the activation energy U(T) in thermally activated flux flow in FexSe0.5Te0.5 near the superconducting transition temperature Tc. The variations in Hc2(T) with temperature are analyzed using Ginzburg-Landau (GL), Werthamer-Helfand-Hohenberg (WHH) models along with the empirical relation (ER). The obtained values of Hc2(0) depend strongly on the model and the criteria used to determine the transition temperature. However, the general trend is that that Hc2(0) increases with the increasing Fe content. The activation energy U(T) is maximum for x = 1 and rapidly suppressed by excess or deficiency of iron. The low values of U(T) (∼10 meV) reflect the low vortex-pinning nature (due to defects, vacancies, etc.) in the FexSe0.5Te0.5 superconductor.

Original languageEnglish
Pages (from-to)1727-1732
Number of pages6
JournalJournal of Superconductivity and Novel Magnetism
Volume31
Issue number6
DOIs
StatePublished - 1 Jun 2018

Bibliographical note

Publisher Copyright:
© 2017, Springer Science+Business Media, LLC.

Keywords

  • Activation energy
  • Fe-based superconductors
  • Werthamer-Helfand-Hohenberg (WHH) models

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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