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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 dlgHm(χm″)∕dlgω 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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Chen et al. (2005) studied this question.
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