Effects of Iron Contents on the Vortex State in Fe{sub x}Se{sub 0.5}Te{sub 0.5}
- King Fahd University of Petroleum and Minerals, College of Science (Saudi Arabia)
- Imam Abdulrahman Bin Faisal University, Department of Basic Sciences and Humanities, College of Engineering (Saudi Arabia)
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.
- OSTI ID:
- 22771182
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Vol. 31, 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); ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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