Abstract
We have investigated experimentally the penetration of low magnetic fields into Bi-based ceramics. The behavior of the harmonics of the induction was investigated in ac and dc fields in a wide range of temperatures and field amplitudes. From the experimental results obtained in the asymptotic case of a weak field the values of a number of quantities characterizing the low-field electrodynamics of HTSC and their temperature dependences as well as an explicit expression for the critical current density j c(H, T)= j o(T)H o(T) [|H| + H o(T)] were derived.
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