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

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

doi:10.1088/1742-6596/869/1/012034

Thermally activated flux flow in FeSe_0.5Te_0.5 superconducting single crystal

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

Research output: Contribution to journal › Conference article › peer-review

Abstract

The current-voltage (J-E) isotherms of single crystal FeSe_0.5Te_0.5 sample have been measured at several temperatures near the transition temperature (T_c) and under applied magnetic fields (H). A power law (E ∼ J^β ) has been used to fit the data and evaluate the activation energy U_o (T) using β = U_o/k_BT. At low current density (J << J_c), the initial behaviour is associated with thermally activated flux Flow (TAFF) while at J >> J_c vortex flux flow (FF) behavior is expected. The effects of applied magnetic field on FF and TAFF also been investigated. We found that U_o(FF) was reduced with by about an order of magnitude in magnetic fields as low as ∼1.5 Tesla-the reduction in U_o(TAFF) is even faster than in U_o(FF)-hence reflecting the low pinning nature (defects, vacancies etc.) of FeSe_0.5Te_0.5 superconductor.

Original language	English
Article number	012034
Journal	Journal of Physics: Conference Series
Volume	869
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/869/1/012034
State	Published - 11 Jul 2017

Bibliographical note

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

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1088/1742-6596/869/1/012034

Cite this

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title = "Thermally activated flux flow in FeSe0.5Te0.5 superconducting single crystal",

abstract = "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.",

author = "Hamad, {R. M.} and Kayed, {T. S.} and S. Kunwar and Ziq, {Kh A.}",

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T1 - Thermally activated flux flow in FeSe0.5Te0.5 superconducting single crystal

AU - Hamad, R. M.

AU - Kayed, T. S.

AU - Kunwar, S.

AU - Ziq, Kh A.

PY - 2017/7/11

Y1 - 2017/7/11

N2 - 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.

AB - 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.

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