SKIN-EFFECT IN POLYCRYSTALS

With the assumption of weak anisotropy of conductivity tensor of singl e crystal grains forming a polycrystal, the effective impedance of the polycrystal-line metal has been estimated under anomalous skin-effect when a mean crystallite size is greater than the electron tree path l ength. In the calculation the perturbation theory was used, as well as the Fourier transformation permitting to avoid calculation of random fields in r-representation. Using the Fourier method, the expressions have been reconstructed obtained earlier for the effective impedance o f polycrystalline metal under normal skin effect. The calculation proc edure proposed makes it possible to estimate the effective impedance o f polycrystals of different metals. In the case or anomalous skin-effe ct, the numerical value of effective impedance has been calculated In the framework of a simple model of quadratic dispersion law of conduct ion electrons of Initial single crystal.