Phonons of Phase-Change Materials

Gaspard, Jean-Pierre; Gaspard, Jean-Pierre; Gaspard, Jean-Pierre

doi:10.1002/pssr.202200111

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Phonons of Phase-Change Materials

Gaspard, Jean-Pierre; Gaspard, Jean-Pierre; Gaspard, Jean-Pierre

2022 • In Physica Status Solidi. Rapid Research Letters, p. 2200111

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https://hdl.handle.net/2268/293975

DOI
10.1002/pssr.202200111

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Keywords :

covalent bond; Grüneisen parameter; phase-change materials; phonons; Condensed Matter Physics; General Materials Science

Abstract :

[en] Phase-change materials (PCMs) undergo a reversible transition from a semiconducting to a metallic state, nicely termed “incipient metal.” This transition is driven by a Peierls distortion. A model of covalent bonding is developed in a tightbinding scheme that accounts for the drastic evolution of some properties of PCMs, among which the Grüneisen parameter. The original vibrational properties of PCM and related Peierls distorted materials are analyzed. A three-body covalent interaction describes the PCM properties. It explains the simultaneous softening of the optical phonons and the hardening of the acoustic phonons upon crystallization of the PCMs.

Disciplines :

Physics

Author, co-author :

Gaspard, Jean-Pierre ; Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures

Gaspard, Jean-Pierre ; Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures ; Theory Group, Laue-Langevin Institute, Grenoble Cedex 9, France

Language :

English

Title :

Phonons of Phase-Change Materials

Publication date :

03 August 2022

Journal title :

Physica Status Solidi. Rapid Research Letters

ISSN :

1862-6254

eISSN :

1862-6270

Publisher :

Wiley

Pages :

2200111

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://onlinelibrary.wiley.com/doi/pdf/10.1002/pssr.202200111

Available on ORBi :

since 23 August 2022

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