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Title: On the interplay of liquid-like and stress-driven dynamics in a metallic glass former observed by temperature scanning XPCS
(Submitted on 18 Mar 2024 (v1), last revised 22 Mar 2024 (this version, v2))
Abstract: 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.
Submission history
From: Maximilian Frey [view email][v1] Mon, 18 Mar 2024 23:12:01 GMT (1742kb)
[v2] Fri, 22 Mar 2024 13:42:09 GMT (1709kb)
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