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Title: Effects of Iron Contents on the Vortex State in Fe{sub x}Se{sub 0.5}Te{sub 0.5}

Abstract

We investigate the effects of iron content on the upper critical field (H{sub c2}) and the activation energy U(T) in thermally activated flux flow in Fe{sub x}Se{sub 0.5}Te{sub 0.5} near the superconducting transition temperature T{sub c}. The variations in H{sub 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{sub c2}(0) depend strongly on the model and the criteria used to determine the transition temperature. However, the general trend is that that H{sub 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{sub x}Se{sub 0.5}Te{sub 0.5} superconductor.

Authors:
 [1];  [2];  [1];  [2];
  1. King Fahd University of Petroleum and Minerals, College of Science (Saudi Arabia)
  2. Imam Abdulrahman Bin Faisal University, Department of Basic Sciences and Humanities, College of Engineering (Saudi Arabia)
Publication Date:
OSTI Identifier:
22771182
Resource Type:
Journal Article
Journal Name:
Journal of Superconductivity and Novel Magnetism
Additional Journal Information:
Journal Volume: 31; Journal Issue: 6; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Article Copyright (c) 2017 Springer Science+Business Media, LLC; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1557-1939
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; CRITICAL FIELD; GINZBURG-LANDAU THEORY; IRON; MAGNETIC FLUX; MEV RANGE; SUPERCONDUCTORS; TRANSITION TEMPERATURE; VACANCIES

Citation Formats

Hamad, R. M., Kayed, T. S., Kunwar, S., Elsayed, K. A., Abu-Ruz, E., and Ziq, Kh. A., E-mail: kaziq@kfupm.edu.sa. Effects of Iron Contents on the Vortex State in Fe{sub x}Se{sub 0.5}Te{sub 0.5}. United States: N. p., 2018. Web. doi:10.1007/S10948-017-4391-Z.
Hamad, R. M., Kayed, T. S., Kunwar, S., Elsayed, K. A., Abu-Ruz, E., & Ziq, Kh. A., E-mail: kaziq@kfupm.edu.sa. Effects of Iron Contents on the Vortex State in Fe{sub x}Se{sub 0.5}Te{sub 0.5}. United States. https://doi.org/10.1007/S10948-017-4391-Z
Hamad, R. M., Kayed, T. S., Kunwar, S., Elsayed, K. A., Abu-Ruz, E., and Ziq, Kh. A., E-mail: kaziq@kfupm.edu.sa. 2018. "Effects of Iron Contents on the Vortex State in Fe{sub x}Se{sub 0.5}Te{sub 0.5}". United States. https://doi.org/10.1007/S10948-017-4391-Z.
@article{osti_22771182,
title = {Effects of Iron Contents on the Vortex State in Fe{sub x}Se{sub 0.5}Te{sub 0.5}},
author = {Hamad, R. M. and Kayed, T. S. and Kunwar, S. and Elsayed, K. A. and Abu-Ruz, E. and Ziq, Kh. A., E-mail: kaziq@kfupm.edu.sa},
abstractNote = {We investigate the effects of iron content on the upper critical field (H{sub c2}) and the activation energy U(T) in thermally activated flux flow in Fe{sub x}Se{sub 0.5}Te{sub 0.5} near the superconducting transition temperature T{sub c}. The variations in H{sub 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{sub c2}(0) depend strongly on the model and the criteria used to determine the transition temperature. However, the general trend is that that H{sub 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{sub x}Se{sub 0.5}Te{sub 0.5} superconductor.},
doi = {10.1007/S10948-017-4391-Z},
url = {https://www.osti.gov/biblio/22771182}, journal = {Journal of Superconductivity and Novel Magnetism},
issn = {1557-1939},
number = 6,
volume = 31,
place = {United States},
year = {Fri Jun 15 00:00:00 EDT 2018},
month = {Fri Jun 15 00:00:00 EDT 2018}
}