Abstract:
The temperature dependences of the heat-conductivity coefficient $(\chi)$ and the thermopower $\alpha$ of Ag$_2$S are investigated in the range of 4.2–300 K. It is found that the value of 6h sharply increases $(\alpha\propto T^{-3})$ with decreasing $T$ at $T <$ 100 K and passes through a maximum at 16–18 K. The heat-conductivity coefficient passes through a maximum at $\approx$ 30 K. The sharp increase in $\alpha$ is found to be caused by the effect of long-wavelength-phonon drag of electrons. It is shown that the shift of the $\alpha$ and $\chi$ peaks, as well as the temperature dependence of the phonon thermopower $\alpha_{\mathrm{ph}}\propto T^{-3}$, agrees with the Herring theory.
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