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Temperature-dependent power factor of (A), comparison of room temperature power factor among different specimens of (B), relationship between the Hall mobility and power factor for (C), and relationship between the temperature exponent and power factor for (D) Mg3.2Sb1.5Bi0.49Te0.01 and Mg3.1A0.1Sb1.5Bi0.49Te0.01 (A = Fe, Co, Hf, and Ta). Data from ref. 33 in panel A.
