Abstract
We present a comprehensive study of vortex matter in the FeSe1−x S x system with various doping degree. The influence of sulphur substitution on peak effect occurrence is studied. Additionally, we study a possible vortex liquid–vortex glass/lattice transition and find an evidence that the vortex liquid–vortex glass phase transition in FeSe1−x S x has a quasi two–dimensional nature. We investigate the upper critical field behaviour in FeSe1−x S x system, and found that the upper critical field is higher than that predicted by the Werthamer–Helfand–Hohenberg (WHH) model, whereas its temperature dependence could be fitted within a two-band framework. Finally, a detailed H–T phase diagram is presented.
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