Abstract
On a set of 12 bulk and highly pure [residual resistance ratio (RRR) up to 6000] iron single crystals with different crystallographic orientation and on polycrystalline material the ``hidden'' basic resistivity $\ensuremath{\rho}(T,B\ensuremath{\rightarrow}0)$ and magnetoresistive effects (anisotropic magnetoresistance, longitudinal and transverse Lorentz resistance) are quantitatively disentangled. The temperature-dependent basic resistivity for $T\ensuremath{\le}30\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ follows a $\ensuremath{\Delta}\ensuremath{\rho}(T,B\ensuremath{\rightarrow}0)=a{T}^{2}+b{T}^{5}$ law, proving that electron-electron and electron-phonon scattering (with a resistive Debye temperature ${\ensuremath{\Theta}}_{\mathrm{R}}\ensuremath{\cong}450\phantom{\rule{0.28em}{0ex}}\mathrm{K}$) are dominant also in iron, similar to nonferromagnetic transition metals. Here the crystal-orientation dependence of the intrinsic longitudinal magnetoresistance in the single-domain state could be quantitatively evaluated in accordance with the symmetry of the Fermi surface. The transverse magnetoresistance (TMR) turns out to be the sum of the so-called ``two-band conduction term'' and the unboundedly growing TMR term in compensated metals. It is proven that the second term is not restricted to the high-field limit (as usually discussed up to now) but acts down to lowest TMR or ${\ensuremath{\omega}}_{\mathrm{C}}\ensuremath{\tau}$ values. This conclusion is verified by TMR measurements on highly pure molybdenum single crystals (RRR \ensuremath{\cong} 100 000). Supported by Kerr microscopy, a small positive domain wall resistance (DWR) could be isolated from the dominating negative DWR in the multidomain state of iron, resulting in a relation of larger than 5:1 for the electrons to pass a domain wall with spin tracking compared to scattering with spin conservation.
Published Version
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