| Autor: |
Frey, Maximilian, Neuber, Nico, Riegler, Sascha Sebastian, Cornet, Antoine, Chushkin, Yuriy, Zontone, Federico, Ruschel, Lucas, Adam, Bastian, Nabahat, Mehran, Yang, Fan, Shen, Jie, Westermeier, Fabian, Sprung, Michael, Cangialosi, Daniele, Di Lisio, Valerio, Gallino, Isabella, Busch, Ralf, Ruta, Beatrice, Pineda, Eloi |
| Rok vydání: |
2024 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
Modern detector technology and highly brilliant fourth-generation synchrotrons allow to improve the temporal resolution in time-resolved diffraction studies. Profiting from this, we applied temperature scanning X-ray photon correlation spectroscopy (XPCS) to probe the dynamics of a Pt-based metallic glass former in the glass, glass transition region, and supercooled liquid, covering up to six orders of magnitude in time scales. Our data demonstrates that the structural alpha-relaxation process is still observable in the glass, although it is partially masked by a faster source of decorrelation observed at atomic scale. We present an approach that interprets these findings as the superposition of heterogeneous liquid-like and stress-driven ballistic-like atomic motions. This work not only extends the dynamical range probed by standard isothermal XPCS, but also clarifies the fate of the alpha-relaxation across the glass transition and provides a new perception on the anomalous, compressed temporal decay of the density-density correlation functions observed in metallic glasses and many out-of-equilibrium soft materials. |
| Databáze: |
arXiv |
| Externí odkaz: |
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