Bulletin of the American Physical Society
APS March Meeting 2023
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q05: Ultra-Stable Glasses
3:00 PM–5:48 PM,
Wednesday, March 8, 2023
Room: Room 128
Sponsoring
Unit:
DPOLY
Chair: Gregory McKenna, North Carolina State University; Mark Ediger, University of Wisconsin - Madison
Abstract: Q05.00007 : Relaxation dynamics of stable glassesJavier Rodriguez-Viejo*
4:12 PM–4:48 PM
Presenter:
Javier Rodriguez
(Universidad Autónoma de barcelona)
Authors:
Javier Rodriguez
(Universidad Autónoma de barcelona)
Marta Gonzalez-Silveira
(Universidad Autonoma de Barcelona)
Cristian Rodriguez-Tinoco
(Universidad Autonoma de Barcelona)
Jordi Fraxedas
(Catalan Institute of Nanoscience and Nanotechnology)
Ana Vila-Costa
(Universidad Autonoma de Barcelona)
Marta Rodriguez-Lopez
(Universidad Autonoma de Barcelona)
Marta Ruiz
(Universidad Autonoma de Barcelona)
The understanding of the glass transition remains incomplete after almost a century of intense investigation and debate. The conventional view is that the transition from glass to liquid appears as a dynamic process where atoms or molecules cooperatively relax into the equilibrium phase. In contrast to this picture, following fast temperature up-jumps above Tg, the emergence of liquid regions occurs in both liquid-cooled and vapor-deposited glasses provided the ratio between the relaxation time of the glass, τglass, and the alpha relaxation time, τα is sufficiently large [1,2]. At temperatures at which τglass/τα is large, high mobility regions directly transit into the liquid and subsequently grow by dynamic facilitation before – or while - cooperative glass relaxation sets into play. On the contrary, at temperatures associated with smaller τglass/τα the glass transition proceeds by cooperative relaxation dynamics all across the material. This behavior highly depends on the stability of the glass, since the time to transform the glass and the length scale between high mobility regions drastically changes with stability [3]. I will also discuss new evidences of the heterogeneous transformation of stable glasses by localized soft spots separated by giant length scales associated to dynamical heterogeneities in the glass and their growth by dynamic facilitation [4].
*We acknowledge Grant PID2020-117409RB-I00 funded by MCIN/AEI/ 10.13039/501100011033. CRT is a Serra Hunter Fellow. The ICN2 was funded by the CERCA programme / Generalitat de Catalunya. The ICN2 was supported by the Severo Ochoa Centres of Excellence Programme, funded by the Spanish Research Agency (AEI, Grant no. SEV-2017-0706).
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