Figure 48

Fig. 48: Temperature variation of the relative change in lattice spacing d/d of NaV₂O₅ along [005]. The inset at bottom right shows the log-log plot of normalized strain / ₀against reduced temperature t in the critical regime. The insert at top left shows a plot of d/d (strain) along [005] at different temperatures below T_SP against the integrated intensity of the (3/2, 1/2, 15/4) superlattice reflection which is proportional to the square of the order parameter .