Physics – Condensed Matter – Materials Science
Scientific paper
2011-03-01
Appl. Phys. Lett. 99, 121910 (2011)
Physics
Condensed Matter
Materials Science
12 pages, 3 figures
Scientific paper
10.1063/1.3640227
We have performed coherent x-ray scattering experiments on the hexagonally reconstructed Pt (001) surface to study the temperature-dependent surface dynamics. By correlating speckle patterns collected at the (001) anti-Bragg position we are able to measure surface dynamics when the averaged incoherent x-ray scattering appears static. In the temperature range above the rotational epitaxy transition and below the roughening transition (1750 K - 1830 K), we have observed well-defined oscillatory autocorrelations of speckles that persist for tens of minutes, in addition to the expected thermal decorrelation. The observed oscillations indicate surface dynamics due to "step-flow" motion. This is shown with a simple model in which the phase of the scattered x-rays from the steps within the illumination area is retained in the coherent x-ray scattering. This demonstrates a possibility that x-ray speckles can be used to monitor the real-space real-time evolution of surfaces in addition to the traditional decorrelation measurements.
Barbour A.
Chang Kee-Chul
Hennessy D.
Komanicky Vladimir
Pierce Michael S.
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