Abstract
Measurements of and ( is the electrical resistivity and is the thermal resistivity) of high-purity single-crystal specimens of tungsten have been performed in the temperature range 1.5-6.0 K. The temperature dependence of and was found to be predominantly quadratic, in agreement with observations in other transition metals. We attribute this behavior to electron-electron scattering between different branches of the Fermi surface. The validity of Matthiessen's rule for impurity and boundary scattering was investigated to determine whether the contributions of electron-electron scattering and could be meaningfully separated from the total resistivities and . In those samples in which boundary scattering contributed least to the total resistivities, Matthiessen's rule was found to be reasonably well obeyed for the electrical resistivity, while deviations were observed for the thermal resistivity. The Lorenz number for electron-electron scattering, , for these samples was found to range from 0.2× to 0.4× WΩ/.
- Received 13 January 1971
DOI:https://doi.org/10.1103/PhysRevB.3.3141
©1971 American Physical Society