首页|Effect of K-doping on the superconducting properties of FeSe0.5Te0.5 single crystals
Effect of K-doping on the superconducting properties of FeSe0.5Te0.5 single crystals
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NSTL
Elsevier
? 2022 Elsevier B.V.Fe1?xKxSe0.5Te0.5 ( x = 0, 0.025, 0.05, 0.075 and 0.1) single crystals were grown by self-flux method. The effects of K-doping on the length of c-axis, critical temperature, anisotropy and critical current density were investigated. With the increase of K-doping content x, the length of c-axis increases, the critical temperature rises at first and then falls, and the anisotropy decreases. The critical current density displays a significant increase at x = 0.075. Subsequently, the superconducting properties of Fe0.925K0.075Se0.5Te0.5 were thoroughly studied. The field-dependent pinning energy U(H) and the temperature-dependent upper critical field Hc2(T) were given. Additionally, the Dew-Hughes model was used to scale the flux pinning force, and the result suggests that the superconductor had a temperature-induced pinning mechanism from normal point pinning to normal surface pinning, in which twins play an important role. We also discussed the temperature-dependent critical current density Jc(T)=Jc(0)(1-T/T1)n and found that the n-value depends on different flux pinning regimes, including single flux pinning, strong collective pinning associated with twins and weak collective pinning associated with point defects.
AnisotropyCritical current densityCritical temperatureFe1?xKxSe0.5Te0.5 single crystal
NSTL
Elsevier
