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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