Strong pinning and elastic to plastic vortex crossover in Na-doped CaFe2As2single crystals

Critical current density, vortex dynamics, and phase diagram of single-crystal FeSe

“…S ∼ 0.02 for zero field). The plateau and large vortex creep rate were also observed in YBa 2 Cu 3 O 7−δ , 7 and other IBSs, [8][9][10]12,13,30,38 which can be interpreted by the collective creep theory. Fig.…”

“…Until now, most detailed studies on the vortex dynamics were performed on cuprates 3,6,7 and IBSs "122" phase [8][9][10][11][12][13][14] since high-quality single crystals are readily available. Through extensive research activities on the vortex system in cuprate superconductors, the collective creep theory has successfully interpreted novel features of the large creep rate and plateau region in the temperature dependence of normalized relaxation rate (S = |dlnM /dlnt|), and similar features have also been verified in IBSs.…”

“…Through extensive research activities on the vortex system in cuprate superconductors, the collective creep theory has successfully interpreted novel features of the large creep rate and plateau region in the temperature dependence of normalized relaxation rate (S = |dlnM /dlnt|), and similar features have also been verified in IBSs. [7][8][9][10]12,15 However, some of the above materials possess complicated crystal structures, and all of them need further doping to introduce superconductivity. The complicated structure and element doping will easily cause inhomogeneities and defects in the crystal structure.…”

Universal lower limit on vortex creep in superconductors

“…Additionally, these results will help in designing materials for superconducting devices, wires, and magnets, and could provide insight on open questions in other systems in which topological excitations undergo depinning processes, e.g., skyrmions in magnetic films 40 . 8,23 , where the data for FeSe was extracted from S(H) at different temperatures 9 and we measured Rb0.8Fe1.6SeS 41 . All previous studies of creep in Fe-SCs have been performed on single crystals [5][6][7][8]14,19,22,23,32,[42][43][44] , where self-fields (Hsf ∝ Jc × thickness) are higher than in our films.…”

Magnetic relaxation and collective vortex creep in FeTe 0.6 Se 0.4 single crystal

“…Magnetic relaxation measurements in IBSs reported so far have revealed that they also show giant flux creep and collective pinning, which implies that IBSs and cuprate superconductors may share common vortex physics [7][8][9][10][11][12][13]. Until now, most detailed studies about the vortex dynamics on IBSs have been performed on "122" phase since high-quality single crystals are readily available.…”