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The linear magnetic susceptibility χ(ω) of superconducting strips and disks in a transverse magnetic field is calculated in the flux-creep regime. It is shown that χ(ω)0ex0ex=0ex0exχ^'-iχ^'' for ω1/t is universal, independent of temperature, dc field, and material parameters, depending only on the sample shape, ac frequency ω/2π, and time t elapsed after creep has started. Qualitatively, χ(ω) can be obtained from the χ(ω) of metallic conductors by replacing the Ohmic relaxation time by t. At ωt1, which may apply down to rather low frequencies, the dissipative flux-creep state exhibits a nearly Meissner-like response with χ^'0ex0ex=0ex0ex-1+0.40/ωt and χ^''0ex0ex=0ex0ex0.25ln(29ωt)/ωt for disks.
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Brandt et al. (1996) studied this question.
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