Fig. 2
From: Double thermoelectric power factor of a 2D electron system
SrTiO3–SrNbO3 solid solution: a model system having two different λD. x-dependent effective mass (m*/me, white symbols) and λD (gray symbols) for SrTi1 − xNb x O3 solid solutions. m*/me exerts a decreasing tendency with x, resulting in an increased λD. Sharp changes in both m*/me and λD are detected around x = 0.3 due to the conduction band transition from Ti 3d to Nb 4d. The properties of SrTi1 − xNb x O3 solid solutions can be divided into two regions based on the conduction bands (Ti 3d → region A and Nb 4d → region B). Inset: schematic illustrations of conduction electrons at regions A and B. At region B, λD is ∼5.3 nm, while it is ∼4.1 nm at region A
