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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2015

Ordering fluctuation dynamics in AuAgZn 2

Résumé

The second-order ordering transition of the AuAgZn2 alloy has been studied by coherent x-ray scattering. Within a few degrees above the critical temperature Tc, equilibrium critical fluctuations are observed together with some pre-transitional local ordering connected to sample defects. The speckles observed correspond to heterodyne interference between local ordering and fluctuations and show a mixed static and dynamical behaviour in a narrow domain of a few tenths of degree above Tc. The dynamical behaviour is shown to correspond to the critical slowing down of the fluctuations in the vicinity of the transition (model " A " of Hohenberg and Halperin 1). A rough comparison can be carried out with the classical diffusion models. Some improvements of the method are discussed.
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Dates et versions

hal-01203092 , version 1 (22-09-2015)

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Frédéric Livet, Mathieu Fèvre, Guillaume Beutier, Mark Sutton. Ordering fluctuation dynamics in AuAgZn 2. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, ⟨10.1103/PhysRevB.92.094102⟩. ⟨hal-01203092⟩
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