Electrical and thermal transport measurements on semimetallic rare earth sesquisulfides

TLDR: In this paper, the Cutler-Mott model was modified for magnetic effects by von Moln\'ar, Holtzberg, Penney, and their associates, and measured values of $\ensuremath{rho}$, ${R}_{H}$, $\enuremath{\alpha}$, and ''ensure-math{kappa}$'' were reported on single-crystal samples of the defect lattice structure.

Abstract: Measured values of $\ensuremath{\rho}$, ${R}_{H}$, $\ensuremath{\alpha}$, and $\ensuremath{\kappa}$ are reported on single-crystal samples of ${\mathrm{Nd}}_{2}$${\mathrm{S}}_{3}$, ${\mathrm{Gd}}_{2}$${\mathrm{S}}_{3}$, and ${\mathrm{Dy}}_{2}$${\mathrm{S}}_{3}$ containing excess rare earth in the defect lattice structure. Measurements cover the temperature range between roughly 7 and 1000 K, and an excess rare-earth composition range between 0.1 and 0.7 wt%. Data can be interpreted in terms of the Cutler-Mott model modified for magnetic effects by von Moln\'ar, Holtzberg, Penney, and their associates. Above 100 K, alloy scattering appears dominant. At lower temperatures the transport mechanism favors a hopping process for localized electrons in a magnetically ordered lattice.