Abstract
The low temperature ( T), temperature dependent electrical resistivity (ϱ), and thermal resistivity (ω), have been measured in a sample having a residual resistivity ratio of 10,000: 1. Below approximately 10 K ϱ ∝ T 5 and ω ∝ T 2 — in excellent agreement with theory. Both resistivities are considerably smaller than those obtained by previous workers on less pure samples. Above 10 K the resistivities rise more rapidly with temperature — particularly for ω. The experimentally determined temperature dependent Lorenz number, L i = ϱ ωT is examined and suggests that the augmentation of the horizontal scattering of electrons by umklapp processes is greater for ω than for ϱ.
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