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Phase transitions in argon films

Day, Peter and Lysek, Mark and LaMadrid, Marissa and Goodstein, David (1993) Phase transitions in argon films. Physical Review B, 47 (16). pp. 10716-10726. ISSN 1098-0121.

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We present heat-capacity data detailing the evolution of the first six layers of argon adsorbed on graphite foam. The second and third layers have liquid-solid-gas triple points similar to the first layer. These layers exhibit a phase diagram consisting of two-dimensional solid, liquid, and gas phases on top of a solid film. Above the temperatures of the individual-layer triple points, the melting transition for each layer appears to be first order, and the first two layers show evidence of registry transitions prior to melting. For films of a total thickness of about four layers and up, the melting of each of the first three layers occurs at temperatures above the bulk triple point, as reported by Zhu and Dash [Phys. Rev. B 38, 11 673 (1988)]. Our results confirm those of an ellipsometry study [H. S. Youn and G. B. Hess, Phys. Rev. Lett. 64, 918 (1990)] that found layering transitions above what were believed to be the layering critical-point temperatures. We observe heat-capacity peaks identified with these transitions and with melting transitions that join them with the low-temperature layering transitions. A phase diagram based on these data may represent the signature of a preroughening transition and a disordered flat phase in the bulk-crystal interface.

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Additional Information:© 1993 The American Physical Society. Received 15 January 1993; published in the issue dated 15 April 1993. We have enjoyed fruitful discussions with Dr. Marcel den Nijs and Dr. Peter Weichman. This work was supported by DOE Grant No. DE-FG03-85ER45192.
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Department of Energy (DOE)DE-FG03-85ER45192
Issue or Number:16
Classification Code:PACS: 68.45.-v, 64.70.Dv, 64.60.-i
Record Number:CaltechAUTHORS:20120307-133525943
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Official Citation:Phase transitions in argon films Peter Day, Mark Lysek, Marissa LaMadrid, and David Goodstein pp. 10716-10726
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29624
Deposited By: Ruth Sustaita
Deposited On:13 Mar 2012 18:38
Last Modified:03 Oct 2019 03:43

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