Electrical Resistivity of High-Purity Iron at 4.2 K

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The electrical resistivity of single crystal iron specimens with different orientations and purities and of polycrystalline iron specimens with different purities has been measured at 4.2 K as a function of the measuring current density up to 7 A/mm2 and the applied longitudinal magnetic field up to 1 kOe. The electrical resistivity at 4.2 K without the applied field, ρH=0 (4.2 K), strongly depends on the measuring current density, especially in the low current density region and for high purity specimens. In an applied longitudinal magnetic field of 700 to 800 Oe the electrical resistivity of pure single and poly-crystal specimens takes a minimum value, ρmin (4.2 K), which is independent of the measuring current density and can be measured with high accuracy, regardless of specimen purity and of the orientation of single crystal specimen. The longitudinal magnetoresistivity curves of high-purity single crystal iron specimens are closely related to the magnetization curves characteristic of the longitudinal axis of each specimen.<BR>The modified residual resistivity ratio RRRH based on ρmin (4.2 K) can be used as an appropriate measure of purity for iron. The origin of the resistivity increase with increasing the current density without applied fields and the resistivity decrease under the low longitudinal magnetic fields is discussed in terms of the electron scattering by the internal magnetic field within each magnetic domain.

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