Temperature-dependent order of clean Pd(110)

H. Hörnis, J. D. West, E. H. Conrad, R. Ellialtioǧlu
1993 Physical Review B (Condensed Matter)  
We report high resolution low-energy-electron-diffraction measurements on the Pd(110) surface. We demonstrate that the clean surface consists of semiordered islands. The island structure is stable up to 650'C at which point the island edges roughen and step-step correlations decrease. Above 1100'C, surface evaporation becomes important and the surface becomes kinetically rough. A simple model is presented that makes use of step-step interactions to generate the periodic island structure. This
more » ... d structure. This model predicts that ordered islands form below the roughening temperature if the step creation energy is small compared to the step-step interaction. The existence of isolated steps is shown to be consistent with embedded atom calculations that predict a small step-formation energy on Pd (110) surfaces.
doi:10.1103/physrevb.48.14577 pmid:10007879 fatcat:4fzpyx6mmfhhdion54fcdglyom