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Related Experiment Videos

X-ray intensity fluctuation spectroscopy studies on phase-ordering systems.

Andrei Fluerasu1, Mark Sutton, Eric M Dufresne

  • 1Department of Physics, McGill University, Montreal, Quebec, Canada H3A 2T8. fluerasu@esrf.fr

Physical Review Letters
|March 24, 2005
PubMed
Summary

Researchers studied the order-disorder phase transition in copper-gold alloy (Cu3Au) using x-ray scattering. They observed universal scaling in ordering kinetics and measured fluctuations, revealing new insights into nonconserved systems.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Statistical Mechanics

Background:

  • The order-disorder phase transition in alloys like copper-gold (Cu3Au) is a fundamental phenomenon.
  • Understanding the kinetics of ordering after a rapid temperature change (quench) is crucial for materials properties.
  • Previous studies utilized incoherent x-ray scattering to observe universal scaling in ordering kinetics.

Purpose of the Study:

  • To investigate the fluctuations around the universal scaling form during the ordering process in Cu3Au.
  • To characterize the two-time correlation function in the late stages of ordering.
  • To provide the first experimental results for fluctuations in a nonconserved system.

Main Methods:

  • Utilizing x-ray intensity fluctuation spectroscopy.

Related Experiment Videos

  • Employing time-resolved coherent x-ray scattering.
  • Analyzing the two-time correlation function C(q,t1,t2) with scaling variables Δt = |t1-t2| and t = (t1+t2)/2.

    • Main Results:

    • Ordering kinetics in Cu3Au follows a universal scaling form after quenching from a disordered state.
    • Fluctuations around this scaling form were measured using coherent x-ray scattering.
    • The two-time correlation function exhibits a scaling form that transitions from linear dependence on t to t^(1/2) in the late ordering stages.

    Conclusions:

    • The study successfully measured fluctuations in the ordering process of Cu3Au.
    • The observed crossover in the scaling form of fluctuations provides new information about nonconserved systems.
    • These findings represent a significant advancement in the experimental study of phase transitions in materials.