Effectiveness of Two Pinning Profiles in Controlling Magnetic Critical Current Density in YBCO + YCMO Composites

Impacts of two different types of pinning centres on magnetization ( M ) and magnetic critical current density ( J cm ) of YBCO superconductors have been studied. An enormous increase in M below critical temperature is observed to be caused by inclusions of inter-granular magnetic pinning particles of Y 2 CoMnO 6 (YCMO). However, irreversible magnetization ( ∆ M ) and J cm are decreased by the magnetic pinning profile created by the inclusion of YCMO. H irr ( T ) is differently sensitive to both pinning profiles. A pinning profile created by the oxygen disorder ( δ ) in the presence of a magnetic pinning is found to be effective in controlling M , ∆ M , and J cm . Magnetic pinning landscape is found to be even more effective in controlling J cm . An exponent to explain J cm as a function of H in the intermediate field H has been extracted at several T .