Low-temperature heat transport by charge carriers in doped semiconductors

Abstract

The electronic contribution to the thermal conductivity in degenerate semiconductors has been measured at low temperature in fine-grained ceramic samples in which the lattice thermal conductivity is reduced by grain-boundary scattering of the phonons. The validity of the Wiedemann-Franz-Lorenz law has been demonstrated; the Lorenz number was found to be close to the Sommerfeld value ${L}_{0}$.