Figure 2: Crystal growth and bulk electronic properties (ρ and n) of Sn-BSTS.
From: Sn-doped Bi1.1Sb0.9Te2S bulk crystal topological insulator with excellent properties
(a) The photograph of a crystal boule grown by VBT, an orange line bar represents 1 cm scale. (b) The ρ versus T plots for three freshly cleaved representative samples A, E and G, respectively, taken from the segments at 1, 6 and 10 cm from crystal boule. (c) The log ρ versus 1/T plots for three samples A, E and G, to evaluate thermal activation energy, Δ. The straight lines are exponential fits to the high T data points. (d) The Hall coefficient (RH) versus T plots for the same crystals. The black dotted line is guide to the eye. For samples E and G, RH values show the change of sign from positive to negative.
