Abstract
In the bulk Cu3Au is known to undergo adiscontinuous order-disorder phase transition atT 0=663 K. Spin polarized low-energy-electron diffraction (SPLEED) reveals acontinuous surface-induced order-disorder phase transition-equivalent to a critical wetting transition—on the surface of Cu3Au. The results indicate that nearT 0 the observed singularity is related to the surface order parameter which can be described by a functional dependence of the formt β1 with β1=0.77±0.06.
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