Fig. 2: Temperature-dependent structural dynamics in FePS₃.

a Schematics of the reciprocal- and real-space unit cell before (green dots and lines) and after (red dots and lines) laser excitation. b Dynamics of the \(002\) peak shift (\(\Delta\)q) along the c* direction as a function of the temperature. c Dynamics of the \(\bar{2}02\) peak shift as a function of the temperature. d Dynamics of β change (Δβ) as a function of the temperature. Top panels in (b–d) are the line cuts of three representative temperatures, in which the solid lines represent the fitting results (see text). e Relaxation time of the 002, \(0\bar{2}2\) peak shifts, and Δβ across T_N. \({\tau }_{\beta }\) was fitted by a power-law function detailed in Supplementary Note 5. The vertical green dashed line at 110 K indicates the peak of the thermal relaxation time. The error bars represent the standard deviation of exponential fitting detailed in Supplementary Note 4.