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Ordering fluctuation dynamics in AuAgZn_2

DOI: 10.1103/PhysRevB.92.094102 DOI Help

Authors: Frederic Livet (CNRS) , Mathieu Fèvre (UMR 104 CNRS-ONERA) , Guillaume Beutier (SIMAP) , Mark Sutton (McGill University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 92 (9) , PAGES 094102

State: Published (Approved)
Published: September 2015
Diamond Proposal Number(s): 630

Abstract: 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 pretransitional 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 behavior in a narrow domain of a few tenths of degree above Tc. The dynamical behavior is shown to correspond to the critical slowing down of the fluctuations in the vicinity of the transition (model “A” of Hohenberg and Halperin [Rev. Mod. Phys. 49, 435 (1977)]). A rough comparison can be carried out with the classical diffusion models. Some improvements of the method are discussed.

Subject Areas: Physics, Materials

Instruments: I16-Materials and Magnetism

Other Facilities: APS

Added On: 22/09/2015 10:44

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