Abstract
We study the cross-section for x-ray scattering under conditions of total reflection on surfaces of semi-infinite systems undergoing a continuous phase transition in the bulk. Because of their finite penetration, totally reflected x-rays probe the local surface order parameter and its critical fluctuations. The angular and temperature dependence of the scattered intensity gives experimental access to several critical surface exponents.
We consider in particular order-disorder transitions in binary alloys and discuss some requirements on angular and temperature resolution which have to be met by experiments.
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This work was supported by the Bundesministerium für Forschung und Technologie
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Dietrich, S., Wagner, H. Critical surface scattering of x-rays at grazing angles. Z. Physik B - Condensed Matter 56, 207–215 (1984). https://doi.org/10.1007/BF01304174
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DOI: https://doi.org/10.1007/BF01304174