Study of Composites Consisting of High-Tc Superconductor and Fine Magnetic Particles
M. Timkoa, P. Kopčanskýa, J. Kováča, M. Konerackáa and V. Plecháčekb
a Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53 Košice, Slovak Republic
b Institute of Physics, Czech Academy of Sciences, Cukrovarnícka 10, 162 00 Praha 6, Czech Republic
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The composite systems as a mixture of fine magnetic particles of Fe3O4 and superconducting powder such as Bi1.8Pb0.2Sr2Ca2Cu3O10+x were prepared. The influence of internal magnetic field (generated by magnetic particles) on the superconducting properties of prepared composites were studied as a function of concentration of magnetic particles and their magnetic state. The observed data both of the shielding and the Meissner effect were compared with corresponding linear combination of pure signals of magnetite and superconductor, respectively. The large differences were observed for demagnetized samples. It means that result must be discussed in the frame of the distribution of internal magnetic field created by the magnetic particles.
DOI: 10.12693/APhysPolA.97.389
PACS numbers: 74.72.Hs, 75.50.Tt