5 papers
X-ray photo-induced atomic motion in Phase Change Materials and conventional covalent chalcogenide glasses
Irene Festi, Antoine Cornet, Tomoki Fujita +10
X-ray Photon Correlation Spectroscopy (XPCS) enables direct access to atomic-scale dynamics in disordered materials, revealing both spontaneous and X-ray-induced relaxation process…
Isothermal Annealing Effects on -Relaxations and Crystallization Behaviors in Amorphous GeTe
Arune Makareviciute, Qun Yang, Tomoki Fujita +12
A secondary -relaxation process is often the dominant source of atomic dynamics below in many glass forming systems. Recent studies reported the presence of …
From Continuous to First-Order-Like: Amorphous-to-Amorphous Transition in Phase-Change Materials
Tomoki Fujita, Yoshio Kono, Yuhan Chen +13
Polymorphism is ubiquitous in crystalline solids. Amorphous solids, such as glassy water and silicon, may undergo amorphous-to-amorphous transitions (AATs). The nature of AATs rema…
Directly observing atomic-scale relaxations of a glass forming liquid using femtosecond X-ray photon correlation spectroscopy
Tomoki Fujita, Yanwen Sun, Haoyuan Li +25
Glass forming liquids exhibit structural relaxation behaviors, reflecting underlying atomic rearrangements on a wide range of timescales. These behaviors play a crucial role in det…
Unveiling the Boson Peaks in Amorphous Phase-Change Materials
Jens Moesgaard, Tomoki Fujita, Shuai Wei
The Boson peak is a universal phenomenon in amorphous solids. It can be observed as an anomalous contribution to the low-temperature heat capacity over the Debye model. Amorphous p…