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Bibliographic Details
Main Authors:	Fujita, Tomoki, Kono, Yoshio, Chen, Yuhan, Moesgaard, Jens, Takahashi, Seiya, Makareviciute, Arune, Kakizawa, Sho, Campi, Davide, Bernasconi, Marco, Ohara, Koji, Inoue, Ichiro, Hayashi, Yujiro, Yabashi, Makina, Nishibori, Eiji, Mazzarello, Riccardo, Wei, Shuai
Format:	Preprint
Published:	2025
Subjects:	Materials Science
Online Access:	https://arxiv.org/abs/2504.07154
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Table of Contents:

Polymorphism is ubiquitous in crystalline solids. Amorphous solids, such as glassy water and silicon, may undergo amorphous-to-amorphous transitions (AATs). The nature of AATs remains ambiguous, due to diverse system-dependent behaviors and experimental challenges to characterize disordered structures. Here, we identify two ordered motifs in amorphous phase-change materials and monitor their interplay upon pressure-induced AATs. Tuning temperature, we find a crossover from continuous to first-order-like AATs. The crossover emerges at a special pressure-temperature combination, where the AAT encounters a maximum in crystallization rate. Analyzing the two ordered motifs in a two-state model, we draw a phenomenological parallel to the phase transition behavior of supercooled water near its second critical point. This analogy raises an intriguing question regarding the existence of a critical-like point within amorphous solids.

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