The righi-leduc effect of aluminium and indium

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Abstract
The Righi-Leduc effect (thermal Hall effect) of polycrystalline plates of pure aluminium and indium has been measured at liquid helium temperatures. A good agreement between general theory and experiments has been found in the limit of high magnetic fields, and the Wiedemann-Franz law has been shown to hold with good approximation for the Hall coefficients in the case of aluminium. For indium, however, the increase of inelastic phonon scattering causes deviations from the Wiedemann-Franz law which increase with temperature. In terms of a two-band model the results suggest that the ratio between the thermal relaxation times for the two bands varies significantly with temperature in the helium range.