Abstract
SmS undergoes a pressure-induced phase transition from a semiconducting to a mixed-valent state. Although the mixed valence state has been extensively studied, the semiconducting state with a divalent ionic state is not well understood yet. Here we report transport properties of the low-pressure semiconducting phase. Combining the thermoelectric power with the electrical resistivity, we observe that the mobility of electrons excited onto the conduction band is much greater than that of holes left behind in the valence band, the electron effective mass is nearly equal to the hole effective mass, and the relaxation time of the electron is much larger than that of the hole.
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