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Two different dielectric anomalies caused by slight changes in compositional disorder. Quasi-static dielectric constant hysteresis of sample (1) (top) and (2) (bottom) in equilibrium conditions. Dashed vertical lines indicate the final equilibration temperatures Ta Tb used in the diffraction cancellation experiments. Note that in the text and are, respectively, the cooling Curie points of the two samples.
Standard supercooling protocol: (a) Thermal trajectory T(t) manifesting no loops, i.e., a monotonic cooling of the sample. (b) Input and output intensity distribution (at the end of the thermal trajectory T(t)) manifesting spreading due to optical diffraction ().
Kovacs protocol: (a) T(t) manifesting characteristic loops associated to thermal dips and humps (the non-monotonic cooling/heating of the sample); (b) input and output intensity distribution (at the end of the thermal trajectory T(t)) manifesting diffraction cancellation ().
Equalizing the scale-free regime at the two equilibration temperatures (a) and °C (b), as a consequence of non-monotonic thermal trajectories (as in Fig. 3(a)): Input (grey) and output x intensity profiles, with standard linear diffraction (red) and scale-free regime (blue) propagation for both samples (1) (up) and (2) (bottom).
Temporal formation dynamics of the scale-free propagation: FWHM of the exiting beam as a function of time, for sample (1) (up) and (2) (bottom) (black squares), compared to the FWHM of the entering beam (red circles), at the two considered final equilibration temperatures (a) and (b) .
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