Abstract
The linear ac susceptibility in a transverse magnetic ac field is calculated for thin strips and disks with arbitrary complex resistivity ${\mathrm{\ensuremath{\rho}}}_{\mathrm{ac}}$(\ensuremath{\omega}). The exact result is approximated with high precision by a finite sum. This analytic expression allows one to extract ${\mathrm{\ensuremath{\rho}}}_{\mathrm{ac}}$(\ensuremath{\omega}) from contact-free magnetic measurements on high-${\mathit{T}}_{\mathit{c}}$ superconductors in search for scaling laws and phase transitions. As an example the susceptibility of a superconducting disk with pinning and thermally assisted flux flow is given.
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