Pressure-induced reversal of Peierls-like distortions elicits the polyamorphic transition in GeTe and GeSe.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
07 Dec 2023
07 Dec 2023
Historique:
received:
26
06
2023
accepted:
09
11
2023
medline:
8
12
2023
pubmed:
8
12
2023
entrez:
7
12
2023
Statut:
epublish
Résumé
While polymorphism is prevalent in crystalline solids, polyamorphism draws increasing interest in various types of amorphous solids. Recent studies suggested that supercooling of liquid phase-change materials (PCMs) induces Peierls-like distortions in their local structures, underlying their liquid-liquid transitions before vitrification. However, the mechanism of how the vitrified phases undergo a possible polyamorphic transition remains elusive. Here, using high-energy synchrotron X-rays, we can access the precise pair distribution functions under high pressure and provide clear evidence that pressure can reverse the Peierls-like distortions, eliciting a polyamorphic transition in GeTe and GeSe. Combined with simulations based on machine-learned-neural-network potential, our structural analysis reveals a high-pressure state characterized by diminished Peierls-like distortion, greater coherence length, reduced compressibility, and a narrowing bandgap. Our finding underscores the crucial role of Peierls-like distortions in amorphous octahedral systems including PCMs. These distortions can be controlled through pressure and composition, offering potentials for designing properties in PCM-based devices.
Identifiants
pubmed: 38062025
doi: 10.1038/s41467-023-43457-y
pii: 10.1038/s41467-023-43457-y
pmc: PMC10703813
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
7851Subventions
Organisme : Villum Fonden (Villum Foundation)
ID : 42116
Informations de copyright
© 2023. The Author(s).
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