The Wiedemann-Franz ratio and anomalous lattice conductivity of pure aluminium
- 1 October 1967
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 16 (142) , 691-702
- https://doi.org/10.1080/14786436708222769
Abstract
The thermal and electrical conductivities of several specimens of pure Al have been measured between 1·2°K and 4·2°K, with an experimental scatter of 0·3% to 0·7%. The Wiedemann-Franz ratio of the purer Al specimens appears to extrapolate to a value at T=0 of 2·50×10−8 w ohm deg−2. The ratio for the least pure specimen passes through a maximum which suggests an appreciable lattice contribution to the thermal conductivity. Unambiguous interpretation is not possible, but reasonable arguments suggest a very large lattice conductivity, ascribed to weakly attenuated transverse phonons, which decreases above 2·5°K owing to coupling to the longitudinal modes.Keywords
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