Scaling in the Time Domain: Universal Dynamics of Order Fluctuations in Fe3Al.

SYNCHROTRONS; X-rays; STATICS; DYNAMICS; MECHANICS (Physics); FLUCTUATIONS (Physics)

By focusing a highly brilliant synchrotron x-ray beam to a micrometer spot on a sample, we measured in real time the x-ray intensity fluctuations associated with order fluctuations in crystalline materials. We applied this method to the binary alloy Fe[sub 3]Al near its continuous A2-B2 phase transformation and determined a specific four-point time correlation function for the order parameter. From a detailed theoretical analysis, dynamical scaling in the time domain with a transition from noncritical to critical dynamics is disclosed. [ABSTRACT FROM AUTHOR]

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