Vortex structure in FeTeSe single crystals |
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| Authors: | L. Ya. Vinnikov A. V. Radaev I. S. Veshchunov A. G. Troshina Y. Liu C. T. Lin A. V. Boris |
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| Affiliation: | 1.Institute of Solid State Physics,Russian Academy of Sciences,Chernogolovka, Moscow region,Russia;2.Moscow Institute of Physics and Technology,Dolgoprudnyi, Moscow region,Russia;3.Moscow State University,Moscow,Russia;4.Max-Planck Institut für Festk?rperforschung,Stuttgart,Germany |
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| Abstract: | Vortex structure in FeTe0.66Se0.44 and FeTe0.6Se0.4 single crystals with T c ∼ 11.7 and 14.5 K, respectively, has been studied using the decoration technique. It has been found that in single crystals with the simplest crystalline structure of 11-family iron-containing superconductors (without interlayers), no regular vortex lattice is observed, similar to the case of the previously studied 122 and 1111 families. Using transmission electron microscopy, the dislocation structure with a density of ∼109 cm−2 has been observed. The problem of pinning in iron-containing superconductor single crystals is discussed. |
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