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We have carried out intensity fluctuation spectroscopy measurements using coherent x rays to study the dynamics of critical fluctuations in a binary alloy at equilibrium. An intense coherent hard x-ray beam, produced from an undulator source, was scattered from a single crystal of Fe₃Al held at temperatures near the B2-DO₃ order-disorder transition. A speckle pattern was observed at the (121212) superlattice reflection. Below T₂ it was essentially static, while above T₂ it fluctuated in time. The behavior of the normalized time correlation function is consistent with predictions of theory.
Bräuer et al. (1995) studied this question.