Fig. 2: The KWWMULTI fitting approach in detail. | Nature Communications

Fig. 2: The KWWMULTI fitting approach in detail.

From: Liquid-like versus stress-driven dynamics in a metallic glass former observed by temperature scanning X-ray photon correlation spectroscopy

Fig. 2: The KWWMULTI fitting approach in detail.The alternative text for this image may have been generated using AI.

Intensity autocorrelation function of the representative batch B5, located in the glass transition region upon cooling (510.3 K) as indicated in Fig. 1. The data set consists of 96 mean value data points, the error bars give the standard deviations. The black solid curve represents the conventional Kohlrausch-Williams-Watts (KWW) fit, which fails to describe the cut-off shape of the g2 decorrelation. Instead, the KWWMULTI fit (green solid line) describes the decay exceptionally well. It results from a multiplication of a stretched (KWWS) and a compressed (KWWC) component (orange and purple dashed lines). While KWWS dominates the KWWMULTI fit roughly within the first 57 s (orange background and arrow), KWWC dominates at longer timescales (purple background and arrow), thereby creating the apparent cut-off appearance.

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