X-ray photo-induced atomic motion in Phase Change Materials and conventional covalent chalcogenide glasses
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| Natura: | Preprint |
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2026
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| _version_ | 1866917186096857088 |
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| author | Festi, Irene Cornet, Antoine Fujita, Tomoki Moesggard, Jens Ronca, Alberto Shen, Jie Sprung, Michael Wei, Shuai Westermeier, Fabian Escalier, Raphael Piarristeguy, Andrea Baldi, Giacomo Ruta, Beatrice |
| author_facet | Festi, Irene Cornet, Antoine Fujita, Tomoki Moesggard, Jens Ronca, Alberto Shen, Jie Sprung, Michael Wei, Shuai Westermeier, Fabian Escalier, Raphael Piarristeguy, Andrea Baldi, Giacomo Ruta, Beatrice |
| contents | X-ray Photon Correlation Spectroscopy (XPCS) enables direct access to atomic-scale dynamics in disordered materials, revealing both spontaneous and X-ray-induced relaxation processes. Here, we study two compositionally similar alloy glasses near their glass transition temperatures: the phase change material (PCM) Ge15Sb85 and the non-PCM alloy Ge15Te85. Both exhibit X-ray induced atomic motion, yet with markedly different responses. Ge15Sb85 undergoes an immediate transition to a photo-induced yielding state, characterised by stationary dynamics governed solely by the absorbed dose. In contrast, Ge15Te85 shows a progressive slowing-down of the relaxation process, accompanied by a crossover from compressed to stretched exponential decay in the density autocorrelation functions. This behaviour is consistent with the emergence of liquid-like collective motion as supported by de Gennes narrowing in the wave-vector dependence of the dynamics at length scales comparable with the first sharp diffraction peak. Unlike Ge15Sb85, this alloy does not reach a stationary regime within experimental timescales, implying that the yielding transition occurs only after thousands of seconds with the available dose rate. Its response is also temperature dependent: at lower temperatures, the dynamics reflects intrinsic stress relaxation processes, whereas at higher temperatures becomes dose-controlled. These findings demonstrate that the dynamical response to X-ray excitation is not determined solely by chemical composition or bonding character, but results from the interplay between irradiation effects and structural relaxation pathways. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_02550 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | X-ray photo-induced atomic motion in Phase Change Materials and conventional covalent chalcogenide glasses Festi, Irene Cornet, Antoine Fujita, Tomoki Moesggard, Jens Ronca, Alberto Shen, Jie Sprung, Michael Wei, Shuai Westermeier, Fabian Escalier, Raphael Piarristeguy, Andrea Baldi, Giacomo Ruta, Beatrice Materials Science Disordered Systems and Neural Networks X-ray Photon Correlation Spectroscopy (XPCS) enables direct access to atomic-scale dynamics in disordered materials, revealing both spontaneous and X-ray-induced relaxation processes. Here, we study two compositionally similar alloy glasses near their glass transition temperatures: the phase change material (PCM) Ge15Sb85 and the non-PCM alloy Ge15Te85. Both exhibit X-ray induced atomic motion, yet with markedly different responses. Ge15Sb85 undergoes an immediate transition to a photo-induced yielding state, characterised by stationary dynamics governed solely by the absorbed dose. In contrast, Ge15Te85 shows a progressive slowing-down of the relaxation process, accompanied by a crossover from compressed to stretched exponential decay in the density autocorrelation functions. This behaviour is consistent with the emergence of liquid-like collective motion as supported by de Gennes narrowing in the wave-vector dependence of the dynamics at length scales comparable with the first sharp diffraction peak. Unlike Ge15Sb85, this alloy does not reach a stationary regime within experimental timescales, implying that the yielding transition occurs only after thousands of seconds with the available dose rate. Its response is also temperature dependent: at lower temperatures, the dynamics reflects intrinsic stress relaxation processes, whereas at higher temperatures becomes dose-controlled. These findings demonstrate that the dynamical response to X-ray excitation is not determined solely by chemical composition or bonding character, but results from the interplay between irradiation effects and structural relaxation pathways. |
| title | X-ray photo-induced atomic motion in Phase Change Materials and conventional covalent chalcogenide glasses |
| topic | Materials Science Disordered Systems and Neural Networks |
| url | https://arxiv.org/abs/2601.02550 |