Abstract
We have studied the vortex dynamics of the Tl0.4 K 0.41Fe2−y Se2 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 c2 value and a moderate anisotropy parameter γ are obtained, similar to those found in YBa2Cu3O7−δ superconductor. These results suggest that the Tl0.4 K 0.41Fe2−y Se2 superconductor has a good sustainability under high magnetic field, indicating a good potential for application.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (NSFC) (Grant nos. 11404002 and 11074001) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars from the State Education Ministry, and the “211 Project” of Anhui University(J01001319-J10113190007).
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Yu, Y., Lu, J., Wang, C. et al. Study of the Vortex Dynamics of the Single Crystal Tl0.4 K 0.41Fe1.71Se2 . J Supercond Nov Magn 29, 79–88 (2016). https://doi.org/10.1007/s10948-015-3264-6
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DOI: https://doi.org/10.1007/s10948-015-3264-6