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

doi:10.1007/s10948-017-4391-z

Effects of Iron Contents on the Vortex State in Fe_xSe_0.5Te_0.5

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 journal › Article › peer-review

8 Scopus citations

Abstract

We investigate the effects of iron content on the upper critical field (H_c2) and the activation energy U(T) in thermally activated flux flow in Fe_xSe_0.5Te_0.5 near the superconducting transition temperature T_c. The variations in H_c2(T) with temperature are analyzed using Ginzburg-Landau (GL), Werthamer-Helfand-Hohenberg (WHH) models along with the empirical relation (ER). The obtained values of H_c2(0) depend strongly on the model and the criteria used to determine the transition temperature. However, the general trend is that that H_c2(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 Fe_xSe_0.5Te_0.5 superconductor.

Original language	English
Pages (from-to)	1727-1732
Number of pages	6
Journal	Journal of Superconductivity and Novel Magnetism
Volume	31
Issue number	6
DOIs	https://doi.org/10.1007/s10948-017-4391-z
State	Published - 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

Access to Document

10.1007/s10948-017-4391-z

Cite this

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title = "Effects of Iron Contents on the Vortex State in FexSe0.5Te0.5",

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.",

keywords = "Activation energy, Fe-based superconductors, Werthamer-Helfand-Hohenberg (WHH) models",

author = "Hamad, \{R. M.\} and Kayed, \{T. S.\} and S. Kunwar and Elsayed, \{K. A.\} and E. Abu-Ruz and Ziq, \{Kh A.\}",

note = "Publisher Copyright: {\textcopyright} 2017, Springer Science+Business Media, LLC.",

year = "2018",

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T1 - Effects of Iron Contents on the Vortex State in FexSe0.5Te0.5

AU - Hamad, R. M.

AU - Kayed, T. S.

AU - Kunwar, S.

AU - Elsayed, K. A.

AU - Abu-Ruz, E.

AU - Ziq, Kh A.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - 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.

AB - 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.

KW - Activation energy

KW - Fe-based superconductors

KW - Werthamer-Helfand-Hohenberg (WHH) models

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