## 3 Results and Discussion
The data are fitted with the equation H\({}_{sp}\) = H\({}_{sp}\)(0) (1 \(-T/T^{*}\))\({}^{n}\). Fit results are reported in the text. Inset (**b**): H\({}_{irr}\) versus temperature. The data are fitted with the equation H\({}_{irr}\) = H\({}_{irr}\)(0) (1 \(-T/T^{*}\))\({}^{n}\). Fit results are reported in the text. It is worth to underline the huge H\({}_{\rm c2}\)(0) value which overcomes 200 T. Moreover, the n exponent values for H\({}_{\rm irr}\) and H\({}_{\rm c2}\) are minor than 1 different from what happens in iron-based materials of different families [36; 43; 44; 45; 46; 47]. All the features discussed so far can be summarized by constructing the H(T) vortex phase diagram. In the main panel of Figure 7, H\({}_{\rm c1}\), H\({}_{\rm irr}\), H\({}_{\rm c2}\) are reported together with their fit. It is possible to note a very wide vortex liquid region where the vortices are unpinned [48; 49; 50]. In the framework of power applications of superconductivity, it is worth having the H\({}_{\rm irr}\) line near the H\({}_{\rm c2}\) one to hinder the vortices movement inside the material and the consequent dissipation with depression of critical current density. From this point of view, the sample must be optimized even if its critical current density values are in agreement with the literature [17; 25; 51]. It is worth to underline that the strong pinning region is very narrow compared with the vortex liquid one as shown in the main panel of Figure 1:2 This suggests the presence of a few strong pinning centers and a bad connection among the grains of the polycrystalline sample. This usually causes a fast J\({}_{\rm c}\) decrease as a function of the field due to the efficiency lack of the pinning acting in the sample which leads to wide vortex liquid regions. In the inset of Figure 7, the strong pinning region has been magnified. Even with the zoom, the region below the H\({}_{\rm c1}\) line is barely visible indicating a very weak Meissner state. Between the H\({}_{\rm c1}\) and H\({}_{\rm cross}\) lines, a single vortex behavior has been found. On the other hand, collective pinning characterized by elastic deformations of the vortex lattice can be noted between H\({}_{\rm cross}\) and H\({}_{\rm sp}\) lines. Between H\({}_{\rm sp}\) and H\({}_{\rm irr}\) lines, the plastic deformations rule the vortex dynamics of the sample. It is interesting to highlight that this plastic deformations area is the widest in the framework of the strong pinning region. When plastic deformations act in a sample, the pinning energy as a function of the temperature decreases quickly [52; 53; 54]. This is coherent with the weak pinning strength found in the sample. Finally, the next fascinating challenge is to improve the sample fabrication process in order to drastically reduce the vortex liquid region by nearing the H\({}_{\rm irr}\) line to the H\({}_{\rm c2}\) one. Reaching this target, a huge strong pinning region will be achieved allowing the sample to sustain high J\({}_{\rm c}\) in very high magnetic fields so becoming an interesting candidate for power applications of superconductivity. Figure 1:3 Magnetic moment as a function of the temperature in ZFC condition at different applied magnetic fields. Inset: H\({}_{\rm c2}\) versus T data are fitted with H\({}_{\rm c2}=\) H\({}_{\rm c1}\)(0) \((1-\rm{T}/\rm{T}^{*})^{n}\). Fit results are reported in the text.