摘要Recently, Gamal et al. [Chin. Phys. Lett. 22 (2005) 1530] reported the results of electrical conductivity, Hall effect and thermoelectric measurements on p-type Tl2S5 single crystals. From the experimental data for the temperature dependence of differential thermoelectric power, Gamal et al. determined the values of 2.66×10-41kg and 2.50×10-41kg, respectively, for the effective masses of electrons and holes in p-type Tl2S5, which are about ten orders of magnitude smaller than the free electron mass (9.11×10-31kg). We argue that the anomalously small values obtained for the effective mass of charge carriers in Tl2S5 have no physical significance.
Abstract：Recently, Gamal et al. [Chin. Phys. Lett. 22 (2005) 1530] reported the results of electrical conductivity, Hall effect and thermoelectric measurements on p-type Tl2S5 single crystals. From the experimental data for the temperature dependence of differential thermoelectric power, Gamal et al. determined the values of 2.66×10-41kg and 2.50×10-41kg, respectively, for the effective masses of electrons and holes in p-type Tl2S5, which are about ten orders of magnitude smaller than the free electron mass (9.11×10-31kg). We argue that the anomalously small values obtained for the effective mass of charge carriers in Tl2S5 have no physical significance.
M. Cankurtaran;H. Celik. Comment on `Electronic Properties of Red P-Type Tl2S5 Single Crystals'[J]. 中国物理快报, 2007, 24(6): 1786-1786.
M. Cankurtaran, H. Celik. Comment on `Electronic Properties of Red P-Type Tl2S5 Single Crystals'. Chin. Phys. Lett., 2007, 24(6): 1786-1786.
[1] Gamal G A, Abou Zied M M and Ebnalwaled A A 2005 Chin.Phys. Lett. 22 1530 [2] Kittel C 1986 Introduction to Solid State Physics 6th edn(New York: Wiley) [3] Yu P Y and Cardona M 1996 Fundamentals of Semiconductors:Physics and Material Properties (Berlin: Springer)
2007, Vol. 24 
