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Two-Dimensional Freezing in the Liquid-Vapor Interface of a Dilute Pb:Ga Alloy
Bin Yang, David Gidalevitz, Dongxu Li, Zhengqing Huang and Stuart A. Rice
Proceedings of the National Academy of Sciences of the United States of America
Vol. 96, No. 23 (Nov. 9, 1999), pp. 13009-13011
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/49108
Page Count: 3
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We report the results of x-ray reflectivity and grazing incidence x-ray diffraction studies of the liquid-vapor interface of a dilute alloy of Pb in Ga over the temperature range of 23-76 degrees C. Our data show that the liquid-vapor interface of this alloy is stratified for several atomic diameters into the bulk liquid and that a monolayer of Pb forms the outermost stratum of the interface. Over the temperature range of 23-56 degrees C, the monolayer of Pb is in an ordered hexagonal phase. At about 58 degrees C, this monolayer undergoes a first-order transition to a hexatic phase, which remains stable to 76 degrees C. An analogy between the observed transition and the first-order melting transition in a one-component classical plasma is suggested.
Proceedings of the National Academy of Sciences of the United States of America © 1999 National Academy of Sciences