Evolution of vortex pinning in the FeSe${}_{1-x}$S${}_x$ system

Abstract

We present a comprehensive study of vortex matter and pinning evolution in the FeSe${}_{1-x}$S${}_x$ system with various doping degree. The influence of sulphur substitution on vortex pinning and peak effect occurrence is studied. We show that there is a complex interplay among various pinning contributions in the FeSe${}_{1-x}$S${}_x$ system. Additionally, we study a possible vortex liquid-vortex glass/lattice transition and find an evidence that the vortex liquid-vortex glass phase transition in FeSe has a quasi two-dimensional nature. We investigate the upper critical field behaviour in FeSe${}_{1-x}$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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Cited by in corpus (3)

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• Quasi Two-dimensional Vortex Matter in ThH${}_{10}$ Superhydride