Structural signatures of ultrastability in a deposited glassformer
arXiv:2304.13662 · doi:10.1103/PhysRevLett.130.198201
Abstract
Glasses obtained from vapor deposition on a cold substrate have superior thermodynamic and kinetic stability with respect to ordinary glasses. Here we perform molecular dynamics simulations of vapor deposition of a model glass-former and investigate the origin of its high stability compared to that of ordinary glasses. We find that the vapor deposited glass is characterized by locally favoured structures (LFS) whose occurrence correlates with its stability, reaching a maximum at the optimal deposition temperature. The formation of LFS is enhanced near the free surface, hence supporting the idea that the stability of vapor deposited glasses is connected to the relaxation dynamics at the surface.
Accepted for publication in Phys. Rev. Lett. (https://journals.aps.org/prl/accepted/7a07bY5cL7816472348d41f9d096a93c4bb5f035b) Transfer of copyright provided to the American Physical Society (APS)
References in corpus (11)
- The role of local structure in dynamical arrest
- Roles of icosahedral and crystal-like order in hard spheres glass transition
- Perspective: Highly stable vapor-deposited glasses
- Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures
- On the surface of glasses
- A critical test of the mode-coupling theory of the glass transition
- Origin of ultrastability in vapor-deposited glasses
- Large-scale structure and hyperuniformity of amorphous ices
- Density controls the kinetic stability of ultrastable glasses
- How to "measure" a structural relaxation time that is too long to be measured?
- Local structure of Liquid-Vapour Interfaces