Publication Date:
2016-07-14
Description:
Author(s): A. Madsen, J. Als-Nielsen, J. Hallmann, T. Roth, and W. Lu Many earlier high-resolution x-ray studies of criticality seemingly invalidated the single-length scaling hypothesis that is predicted by the three-dimensional Ising model, a cornerstone in the theory of critical phenomena. Speculations about the reasons for these discrepancies have concentrated on the role of impurities and on surface-induced strain in the crystalline samples. The general validity of the Ising model for real systems has also been questioned. Here, the authors present x-ray scattering data on the temperature-induced order-disorder transition in β -brass, nature’s archetypical realization of the Ising model. These investigations unambiguously show that the Ising model does precisely describe the critical behavior observed and, in particular, that the short-range order parameter indeed exhibits single-length scaling. The surface sensitivity has been varied in the experiments without any substantial differences observed. [Phys. Rev. B 94, 014111] Published Wed Jul 13, 2016
Keywords:
Structure, structural phase transitions, mechanical properties, defects
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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