Figure 2

Simultaneous measurements of the PFM phase, PFM amplitude and AFM topography performed above (a–c) and below (d–f) the temperature of the structural phase transition. All images (a–f) stem from the same surface area on the (001) surface of Sample #1, as clearly seen from the topographic AFM pictures (c,f). The crystallographic directions are indicated in panel (d) according to Fig. 1(e). The yellow dashed rectangle in panel (a) marks the area of the measurements presented later in Fig. 3.