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Two Dimensional Phase Separation for Co Adsorbed on Si(111)

American Physical Society
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We have used low energy electron microscopy to monitor the high-temperature behavior of surface phases in the Co/Si(111) system at submonolayer coverages. We observe a reversible phase separation from a disordered ''(1 x 1)'' phase to well-defined coexisting regions of ordered (7 x 7)-reconstructed and disordered phases. The transition temperature is depressed by nearly 200 degrees C by the addition of 0.1 monolayer of cobalt. The shape of the coverage-temperature phase boundary allows us to estimate the latent heat of the (7 x 7) order-disorder transition.

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