Frequency and ac field scaling of the nonlinear ac susceptibility of a ${\mathrm{HgBa}}_2{\mathrm{CaCu}}_2{\mathrm{O}}_{6+\delta }$ thin film

We confirm a recently proposed scaling relation for the nonlinear ac susceptibility response of type-II superconductors by high-precision measurements on a c-axis oriented ${\mathrm{HgBa}}_2{\mathrm{CaCu}}_2{\mathrm{O}}_{6+\delta }$ thin film. From measurements in different ac field and frequency combinations, given by the scaling relation, the flux creep exponent $n(T,H)\mathrm{}$ of the superconducting film can be determined. At $T=100\mathrm{}\mathrm{K}$ and in the field range studied, $n(T,H)\mathrm{}$ is found to vary with the dc bias field as $H_{\mathrm{dc}}^{-0.18}.$