摘要
Recently, Gamal et al. [Chin. Phys. Left. 22 （2005） 1530] reported the results of electrical conductivity, Hall effect and thermoelectric measurements on p-type T12S5 single crystals. From the experimental data for the temperature dependence of differential thermoelectric power, G amal et al. determined the values of 2.66 × 10^-41 kg and 2.50 × 10^-41 kg, respectively, for the effective masses of electrons and holes in p-type T12S5, which are about ten orders of magnitude smaller than the free electron mass （9.11 × 10^-31 kg）. We argue that the anomalously small values obtained for the effective mass of charge carriers in T12S5 have no physical significance.
Recently, Gamal et al. [Chin. Phys. Left. 22 （2005） 1530] reported the results of electrical conductivity, Hall effect and thermoelectric measurements on p-type T12S5 single crystals. From the experimental data for the temperature dependence of differential thermoelectric power, G amal et al. determined the values of 2.66 × 10^-41 kg and 2.50 × 10^-41 kg, respectively, for the effective masses of electrons and holes in p-type T12S5, which are about ten orders of magnitude smaller than the free electron mass （9.11 × 10^-31 kg）. We argue that the anomalously small values obtained for the effective mass of charge carriers in T12S5 have no physical significance.
