Study of the Vortex Dynamics of the Single Crystal Tl0.4K0.41Fe1.71Se2

We have studied the vortex dynamics of the Tl 0.4 K 0.41 Fe 2− y Se 2 single crystal through the measurements of temperature and magnetic field dependencies of electrical resistivity. Due to the existence of intra-layer Fe-site vacancy and inter-layer Josephson coupling, it is found that the pinning...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2016-01, Vol.29 (1), p.79-88
Main Authors: Yu, Yi, Lu, Junchao, Wang, Chunchang, Li, Qiuju, Wang, Hong, Zhang, Changjin, Pi, Li, Tan, Shun, Zhang, Yuheng
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Original Paper
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary:We have studied the vortex dynamics of the Tl 0.4 K 0.41 Fe 2− y Se 2 single crystal through the measurements of temperature and magnetic field dependencies of electrical resistivity. Due to the existence of intra-layer Fe-site vacancy and inter-layer Josephson coupling, it is found that the pinning of vortices is very strong, which hinders the flux flow. A very high upper critical field H c 2 value and a moderate anisotropy parameter γ are obtained, similar to those found in YBa 2 Cu 3 O 7− δ superconductor. These results suggest that the Tl 0.4 K 0.41 Fe 2− y Se 2 superconductor has a good sustainability under high magnetic field, indicating a good potential for application.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-015-3264-6