Abstract
We report the new LEED observation that lithium atom adsorption on a Si(001) surface at room temperature or below produces a series of ordered phases, (2×2):Li → (2×1):Li → c(3√2 × √2)R45°:Li → streaky c(3√2 × √2)R45°:Li → (4×1):Li → (1×1):Li, depending on adsorbate coverage. This observation partially contradicts previous studies which reported only two phases in the series. We discuss possible origins of the controversy. We then propose a structural model that may account for the sequential appearance of the phases most naturally by invoking a spin-flip mechanism of an impurity stabilized magnetic system. The results suggest that the first phase be a reconstruction of the silicon substrate induced by Li adsorption where asymmetric dimers arrange themselves ferromagnetically and antiferromagnetically along the [11̄0] and [110] directions, respectively.
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