Figure 4
(a) Space-time map of the diffracted intensities from the R phase, which is formed by the intensity line-cut along the red dotted line in Fig. 3 at various time delays. The black dashed line shows the averaged phase boundary defined roughly along 50% of the maximal intensity of the map. The color bar shows the normalized intensity as in Fig. 2c. Its slope is the speed of the in-plane phase propagation near site A. The solid black lines indicate the speed of sound in VO2 and the red dashed line is a reference for non-propagating features. (b) The integrated intensity of three individual sites labeled as A–C in Fig. 3 as a function of time. Error bars correspond to the uncertainty associated with counting statistics.
