Jc enhancement and flux pinning of Se substituted YBCO compound

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

“…Figure 8 a,b shows the field dependence of the static magnetization for the composite 2 at T = 300 K. In weak magnetic fields, an abnormally high increase in magnetization (a) with a small hysteresis (b) turned counterclockwise is observed. With an increase in the magnetic field, the anomalously high component of the magnetization gradually decreases, as is observed in superconductors [ 51 , 52 , 53 , 54 ]. Only diamagnetism is revealed in the composite in strong magnetic fields, which was too observed for r-GO at T = 300 K and polystyrene as individual components at all temperatures.…”

“…It should be noted that this behavior, as well as a slight hysteresis observed at high temperatures in composite 2, are typical of all powder samples of granular high-temperature superconductor (HTSC) [ 52 , 53 , 54 ] and nanowire networks [ 55 ]. With decreasing temperature, the paramagnetic contribution to the total magnetization increases ( Figure 6 , curve 2).…”

“…This behavior of hysteresis is not observed in ferromagnets but is characteristic of granular type-II superconductors [ 52 , 53 ]. The superconducting behavior of the type-II magnetization is more clearly seen after subtracting the diamagnetic and paramagnetic contributions from the total magnetization ( Figure 9 c).…”

“…The hysteresis curve of the magnetization of composite 2 in Figure 9b has the peaks in the weak field's negative/positive regions, which are typical for many hard type-II superconductors [36,37,58]. This behavior of hysteresis is not observed in ferromagnets but is characteristic of granular type-II superconductors [52,53]. The superconducting behavior of the type-II magnetization is more clearly seen after subtracting the diamagnetic and paramagnetic contributions from the total magnetization (Figure 9c).…”

Critical current density and trapped field in HTS with asymmetric magnetization loops

“…ECSM combined with the computation of the field distribution into the sample [2][3][4] gives new facilities for analysis of magnetic characteristics of bulk superconductors. This model is applicable to describe magnetization loops of different superconducting materials [2,[7][8][9][10][11][12][13]. Estimations with using ECSM are useful for constructing of promising application devises (trapped field magnets, magnetic shielding, levitation etc.…”