Roughening Transition and Deconstruction Transition on Au(110)-(2 × 1)

We present results obtained by Thermal Energy Atom Scattering (TEAS) on (2 × 1) reconstructed Au(110). We found a deconstruction transition at T c = 650 K and observed step proliferation at a temperature T R = 690 K approximately. Furthermore we have investigated on the nature and correlation between steps. Below T c we found a density of residual steps, an appreciable amount of which are of multiple height. Above T c , the diffraction peak profile changes from Lorentzian to power law, indicating a mean square height difference which is logarithmic with site distance, characterizing the final state of the well-known Kosterlitz-Thouless-type roughening transition.