Effectiveness of Two Pinning Profiles in Controlling Magnetic Critical Current Density in YBCO + YCMO Composites
Journal of superconductivity and novel magnetism(2023)
Abstract
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 .
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Key words
Superconductors,Magnetization,Vortex pinning,Pinning landscape,Critical current density
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