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Magnetization and critical current density of superconducting granules doped with NiO nanoparticles
Gokhfeld D. M. 1, Semenov S. V.1, Petrov M. I.1
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: gokhfeld@iph.krasn.ru, svsemenov@iph.krasn.ru, petrov@kirensky.ru

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A series of bulk superconducting YBa2Cu3O7-δ (YBCO) samples doped with antiferromagnetic NiO nanoparticles and subjected to 18 h high-temperature annealing have been synthesized. For YBCO samples doped with 8, 12, and 23 nm nanoparticles, the characteristic magnitudes Δ M of the magnetic hysteresis loops were compared and the optimal size of NiO nanoparticles was determined. The effect of the concentration of NiO nanoparticles with an average size of 8 nm on the magnetic hysteresis loops of YBCO and the critical current density at T=4.2 K has been studied. An increase in the critical density of intragranular currents is achieved by adding 0.5 wt.% of NiO nanoparticles. Keywords: magnetic hysteresis, magnetic pinning, RE-123, solid-phase synthesis, granular superconductor, critical current density. DOI: 10.21883/0000000000
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