Diamagnetic properties and critical currents in superconducting ceramics Bi2−<i>x</i>Pb<i>x</i>Sr2Ca2Cu3O<i>y</i>
A. M. DolginPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1I. F. KislyakPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1В. І. ДоценкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1I.F. KononyukInstitute of General and Inorganic Chemistry, Academy of Sciences of the Belorussian SSR, Minsk 2Leonid V. MakhnachInstitute of General and Inorganic Chemistry, Academy of Sciences of the Belorussian SSR, Minsk 2
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Аннотация
The temperature and field dependences of the dynamic magnetic susceptibility are studied as well as the resistive properties of HTS ceramics in the system Bi2−x Pbx Sr2Ca2Cu3Oy (0.2 ≤ x ≤ 0.6). It is shown that they reveal a behavior characteristic of a granular superconductor with Josephson bonds at the grain boundaries. Hysteresis is observed in the field dependences of susceptibility and critical current jc. Empirical relations are derived for the field and temperature dependences of jc. It is shown that the substitution of lead for bismuth in this system has a considerable effect on grain contact parameters but does not change the properties of the bulk superconducting phase 2223.
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