Figure 2: Temperature dependence of Hall density, thermopower and Nernst slope.
From: Evidence for massive bulk Dirac fermions in Pb1−xSnxSe from Nernst and thermopower experiments
(a) The T dependence of the Hall density nH=B/ρyxe inferred from the Hall resistivity ρyx and the zero-B thermopower S (T)≡Sxx(T, B=0) in Pb1−xSnxSe (x=0.23). The Hall signal is n-type at all T. Below 20 K, nH equals 3.46 × 1017 cm−3 (sample 1). nH increases significantly above 200 K signalling thermal activation of holes across the band gap. (b) The T dependence of the initial slope of the Nernst signal dSxy/dB (B→0) to show the sign change at Tinv. The error bars correspond to 1 s.d. in determining dSxy/dB in the limit B→0.
