High-temperature x-ray standing-wave study: application to melting of monolayers of pb on ge(111) surfaces

Dev, B. N. ; Grey, F. ; Johnson, R. L. ; Materlik, G. (1988) High-temperature x-ray standing-wave study: application to melting of monolayers of pb on ge(111) surfaces Europhysics Letters, 6 (4). pp. 311-316. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/6/4/006

Related URL: http://dx.doi.org/10.1209/0295-5075/6/4/006

Abstract

The effect of a substrate temperature of about twice the Debye temperature on the X-ray standing-wave fields has been explored. An atomic scattering amplitude modified by the Debye-Waller factor appears to be adequate for the description of the standing-wave fields. The high-temperature standing-wave method has been applied to study the temperature dependence of Pb monolayers on Ge(111) surfaces. We obtain evidence that the high-temperature (1 × 1) phase of the reversible phase transition √3 × √ 3R30° 1 × 1 is not consistent with a model of a two-dimensional isotropic liquid Pb layer. Rather it appears to be composed of small islands of the original √3 × √3R30° crystalline overlayer.

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ID Code:10051
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