We have performed ac impedance measurements of the melt-textured YBaCuO superconducting slab in a wide range of external dc magnetic field (from zero to 12 T). We have observed a peak in the real part of the impedance. This peak is connected with a skin size effect. It appears when ac penetration skin-size depth is equal to the half of the slab thickens.

In our work we analyze changes of this peak caused by variations of dc magnetic field and temperature. The changes of the peak are connected with some peculiarities of the average conductivity of the superconductor. In high temperature superconductors there are three characteristic ranges of the conductivity: flux-flow, flux-creep and thermally assisted flux-flow (TAFF) range. We analyze the conductivity of the YBaCuO sample by using the impedance measurements.

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