Pflanz, S.; Meyerheim, Holger L.; Moritz, Wolfgang; Robinson, Ian K.; Hoernis, H.; Conrad, E. H.
Anisotropic roughening of vicinally miscut Ag(110): X-ray-reflection profile analysis using the domain-matrix method.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 52, No. 4: pp. 2914-2926
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The roughening behavior of a vicinally miscut Ag(110) surface has been studied with x-ray diffraction using synchrotron radiation. The lateral profiles recorded at different q were analyzed with (a) the domain-matrix method, an evaluation scheme for diffraction profiles, and (b) using a conventional power-law profile shape analysis. Both methods result in a roughening temperature of TR=90020 K (=0.73Tm). The type of the roughening transition is consistent with the predictions of the anisotropic body-centered solid-on-solid (=six-vertex) model with step creation energies of Jx=453 meV and Jy=603 meV along [1»10] and , respectively. At low temperatures, a two-component (bimodal) step distribution corresponding to a bunching of steps is identified.