| Popis: |
The magnetodynamic nonlinearity of the electrical properties of uncompensated metals, wherein the drift of charge carriers at a high density in crossed electric and magnetic fields leads to generation of a self-field of the current, is investigated experimentally and analytically. The experiment is done on cylindrical conductors made from high-purity polycrystallinealuminum, in an arrangement in which the radial current is acted on by an external magnetic field coaxial to the sample. The electric potential and the nonlinear correction to it are determined over a wide range of values of the energy dissipation, all the way up to levels corresponding to the boiling crisis of liquid helium. In the approximation that the contributions to the resistive effect of the external field and self-field are additive, the results of a calculation based on the macroscopic field equations are found to be in good agreement with experiment. Questions pertaining to the concentration of magnetic field energy of the current for a cylindrical geometry of the conductor are discussed in the approximations of long and short solenoids. |
