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Resolving length-scale-dependent transient disorder through an ultrafast phase transition.

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Researchers used ultrafast X-ray scattering to track structural changes in CuIr2S4 after optical pumping. They observed how nanoscale disorder evolves and how structure recovers over picoseconds.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanoscale science

Background:

  • Material properties are governed by nanoscale structures.
  • Pair distribution function analysis offers insights beyond crystal models.
  • Ultrafast structural dynamics are crucial for understanding phase transitions.

Purpose of the Study:

  • To investigate the structural dynamics of CuIr2S4 using ultrafast time-resolved measurements.
  • To probe the evolution of nanoscale disorder and structural ordering after optical excitation.

Main Methods:

  • Utilized time-resolved pair distribution function analysis.
  • Employed X-ray Free Electron Laser (XFEL) facilities for ultrafast measurements.
  • Optically pumped CuIr2S4 from its low-temperature Ir-dimerized phase.

Main Results:

  • Observed optical suppression of dimers without spatial correlation, leading to length-scale-dependent disorder.
  • Tracked the redevelopment of structural ordering over tens of picoseconds.
  • Demonstrated the dynamic interplay between local structure, disorder, and non-equilibrium processes.

Conclusions:

  • Local structure and disorder play a critical role in non-equilibrium dynamics.
  • Ultrafast X-ray scattering is a feasible technique for studying these phenomena.
  • The study provides insights into the transient states of materials under external stimuli.