DISORDERING TRANSITIONS OF METAL SURFACES

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Abstract
We review the results of recent synchrotron x-ray scattering experiments which study the thermal roughening of Ag (110) as well as the roughening and deconstruction of the Au (110) 1x3 reconstruction. The Ag (110) experiments provide direct evidence that the silver surface undergoes a roughening transition at TR = 450° C. Above TR, the rough phase is characterized by logarithmically divergent height fluctuations. For Au (110), it is found that at Tc = 485° C the 1x3 surface undergoes a reversible transition to a structure incommensurate with the bulk crystalline lattice. The data suggest that during this commensurate-incommensurate transition the surface both roughens and deconstructs

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