Antiferromagnetism in semiconducting KFe0.85Ag1.15Te2single crys

Iron chalcogenide superconductors at high magnetic fields

“…It was soon found that sulfur doping can remarkably enhance the J c of K x Fe 2−y Se 2−z S z [67]. As shown in figure Metallic and superconducting state was induced by post-annealing and quenching treatment in as-grown and insulating K x Fe 2−y Se 2 crystals, which is a notable improvement in superconducting properties [69].…”

Vacancy-induced nanoscale phase separation in KxFe2−ySe2Lazarević1, Abeykoon2, Stephens3 et al. 2012Phys. Rev. BSelf Cite487610View full textAdd to dashboardCite

“…13,14 Before starting the RS measurements, the samples were cleaved in order to obtain a flat and shiny (001)-plane surface. The RS measurements were performed using a TriVista 557 Raman system in backscattering micro-Raman configuration.…”

Critical current density and vortex pinning mechanism of Lix(NH3)yFe2Te${}_{1.2}$Se${}_{0.8}$ single crystals

“…Moreover, the decrease of J ab c (µ 0 H) is rather slow with increasing magnetic field, suggesting the strong vortex pinning effect in the sample. It has to be mentioned that because of the bulk superconductivity with large SVF in LiFeTeSe-122, its J ab c is even much larger than that of K x Fe 2−y Se 2 which has much higher T c (∼ 32 K) [24,25]. However, the J ab c of LiFeTeSe-122 is still low when compared to the iron pnictide superconductors where the typical self-field J ab c0 is above 10 6 A/cm 2 at 2 K [26].…”

“…Interestingly, similar values of p and q have also been observed in FeS and FeS 0.94 Se 0.06 single crystals prepared by deintercalating potassium from K x Fe 2−y (S, Se) 2 using the hydrothermal method [29]. It suggests that there is a common type of pinning centers in these materials in contrast to FeSe 0.5 Te 0.5 thin films, K x Fe 2−y Se 2 , and Ba 0.6 K 0.4 Fe 2 As 2 where the point-like defects with normal core are the dominant pinning sources [24,26,30]. Moreover, the F max p can be fitted using F max Fig.…”

“…On the one hand, that impedes the investigation of intrinsic superconducting properties of these materials. On the other hand, it also results in the rather small J c of A x Fe 2−y Se 2 even compared to FeCh [10,11].…”