Prominent bulk pinning effect in theMgB2superconductor

Doping in MgB2 superconductors using a high-pressure furnace

“…3(b). The avalanche of magnetization in the low-field region for Ti-doped MgB 2 was similar to our previous result [6].…”

“…Vortex pinning is the physical phenomenon that determines this quantity [3,4]. Many efforts have been made to increase the pinning property of MgB 2 as samples are prepared as polycrystal, single crystals, and c-axis oriented thin films [5][6][7][8]. Post-treatment such as proton bombardment is reported to increase vortex pinning [9].…”

“…Then, we calculated the critical current density from these curves using a Bean model and compared them with the results from Ref. [6].…”

Magnetization and microwave study of superconductingMgB2

“…It can be seen that T irr (H) decreases with increasing magnetic field. These data are plotted in figure 2b as [32] where H irr was defined as the field where the initial negative maximum in the magnetization is observed when the magnetization is measured as a function of increasing magnetic field. However, it is less than that observed in the HTSC near T c (1.5 to 2.0) [35][36][37].…”

“…The temperature dependence of H irr has also been investigated [31][32][33][34]. For example, two reports of the magnetic irreversibility field have found that H irr scales linearly with the temperature deviation from T c [31,32] but the analysis of H irr reported in two other studies gives a scaling of the form…”