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

R. J. Phaneuf, Y. Hong, S. Horch, Peter Bennett

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Abstract

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 “(1×1)” phase to well-defined coexisting regions of ordered (7×7)-reconstructed and disordered phases. The transition temperature is depressed by nearly 200°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 (7×7) order-disorder transition.

Original languageEnglish (US)
Pages (from-to)4605-4608
Number of pages4
JournalPhysical Review Letters
Volume78
Issue number24
DOIs
StatePublished - Jun 16 1997

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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