Flux-flow critical-state susceptibility of superconductors

Chen, D.-X.; Pardo, E.; Sanchez, A.
June 2005
Applied Physics Letters;6/13/2005, Vol. 86 Issue 24, p242503
Academic Journal
The field-amplitude Hm and circular frequency ω dependent ac susceptibility, χ=χ′-jχ″, of a hard superconducting cylinder with flux-flow type current-voltage characteristic is calculated. A remarkable feature of the resultant χ(Hm,ω) is that both the maximum χ″, χm″, and d lg Hm(χm″)/d lg ω increase with increasing ω. This behavior is observed in actual Bi-2223/Ag tapes and YBa2Cu3O7-δ-coated conductors. Our result provides a useful tool to study the intergranular critical state in high-temperature superconductors.


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