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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electron Microscopy

Background:

  • Electron correlation microscopy (ECM) is crucial for understanding local structural relaxation dynamics in fluctuating systems.
  • Supercooled liquids, particularly metallic glasses, exhibit complex relaxation behaviors that are challenging to characterize.
  • Existing techniques often lack the necessary spatial or momentum resolution.

Purpose of the Study:

  • To develop and implement a novel k-resolved electron correlation microscopy (k-resolved ECM) technique.
  • To investigate the spatial and momentum-resolved relaxation dynamics in metallic supercooled liquids.
  • To establish the experimental parameters required for reliable k-resolved ECM data acquisition.

Main Methods:

  • Utilized five-dimensional scanning transmission electron microscopy to achieve moderate resolution in momentum transfer (k space).
  • Applied k-resolved ECM to a Pt57.5Cu14.7Ni5.3P22.5 metallic supercooled liquid.
  • Analyzed relaxation time data τ(r,k) across spatial (r) and momentum (k) domains.

Main Results:

  • Measured rich spatial and momentum structure in the relaxation time data τ(r,k).
  • Demonstrated that relaxation time maps τ(r) at each azimuthal k are independent samples of the relaxation time distribution.
  • Observed more complex behavior in τ of radial k compared to the de Gennes narrowing seen in X-ray experiments.

Conclusions:

  • The developed k-resolved ECM technique provides unprecedented insight into the momentum-dependent relaxation dynamics of supercooled liquids.
  • The findings challenge existing models and highlight the complexity of structural relaxation in metallic glasses.
  • Defined critical experimental parameters (electron counts, k-pixels, time sampling) for successful k-resolved ECM measurements.