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June 29, 2026The Journal of Physical Chemistry Letters

Photoinduced Structural Instability Toward the Superionic Phase Transition in Cu 2 S

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Authors

GPGaël PrivaultKEKaito En-yaKSKeito Sano

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Overview

Randomized trial investigates structural changes in Cu2S during photoexcitation, indicating pathway to superionic phase.

Key Points

  • This research aims to explore how photoexcitation affects the structural dynamics of Cu2S during its phase transition.
  • Utilized time-resolved electron diffraction to measure structural changes from picoseconds to milliseconds.
  • Analyzed the suppression of semiconductor phase superlattice reflections and lattice expansion during photoexcitation.
  • Applied density functional theory to understand the impact of photoexcitation on Cu-S bond stability.
  • Observed a rapid (80%-90%) suppression of superlattice reflections within ∼10 ps, indicating destabilization of Cu ordering.
  • Identified a slower lattice expansion of approximately 100 ps with a strain of ∼0.7% as diffusion peaks shifted.
  • Determined a critical excitation density for destabilizing the ordered Cu sublattice through fluorescence threshold.

Cite This Study

Privault et al. (2026) studied this question.

synapsesocial.com/papers/6a420ab2f91bb43ea9191ec6https://doi.org/10.1021/acs.jpclett.6c01164
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