Effect of interband scattering on transport phenomena in $p$-PbSb$_2$Te$_4$

Experimental data on transport phenomena in $p$-PbSb$_2$Te$_4$ are qualitatively and quantitatively interpreted within the context of the two-band model with interband scattering in the temperature range 77–300 K. The parameters of the two-band model are determined. Specifically, it is found that the density-of-state effective masses of light and heavy holes are, correspondingly, $m_{d1}\approx$ 0.5 $m_0$ and $m_{d2}\approx$ 0.9 $m_0$ ($m_0$ is the free electron mass) and the energy gap between nonequivalent extrema are $\Delta E_v(T)\approx$ 0.23 – 4.5 $\times$ 10$^{-2}$($T$/100 – 1) eV.