fig3

Figure 3. (A and B) STM images of a selected area with coexistence of Sn-I phase and bare substrate under different sample biases [3 V for (A) and 1 V for (B)]. (C) Height profiles along the corresponding lines in (A) (red curve) and (B) (blue curve). (D) The STM image of a boundary area between Sn-I phase and the bare substrate showing the square-like lattice at the boundary (-50 mV, 50 pA). (E) dI/dV spectra on Al(111) and Sn-I phase.