Abstract
We present high resolution low energy electron diffraction results for the W(430) surface. Unlike every other system studied to date, single atomic height steps on this surface become thermodynamically unfavorable at elevated temperatures. Above 940 K a new phase consisting of bound single and double height steps forms. The transition to double height steps is predicted on the basis of a simple model provided that kinks on the double height steps have a lower formation energy than kinks on single height steps. The new phase is stabilized by a step edge interaction between single-double pairs.
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