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

Y. Hong; Sebastian Horch; P.A. Bennett

doi:10.1103/PhysRevLett.78.4605

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

Y. Hong, Sebastian Horch, P.A. 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 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.

Original language	English
Journal	Physical Review Letters
Volume	78
Issue number	24
Pages (from-to)	4605-4608
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.78.4605
Publication status	Published - 1997
Externally published	Yes

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title = "Two Dimensional Phase Separation for Co Adsorbed on Si(111)",

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 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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AU - Bennett, P.A.

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N2 - 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.

AB - 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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DO - 10.1103/PhysRevLett.78.4605

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JO - Physical Review Letters

JF - Physical Review Letters

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ER -

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

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