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Roughening transitions and surface tension in an HCP lattice with higher neighbor interactions
 

Summary: Roughening transitions and surface tension in an HCP lattice
with higher neighbor interactions
Adham Hashibon, Joan Adler, Gideon Baum, and S. G. Lipson
Department of Physics, Technion­IIT, 32000 Haifa, Israel
(February 2, 1998)
Abstract
We report on Ising lattice­gas simulations of surfaces of a hexagonal­close­
packed (HCP) crystal as a function of temperature and higher neighbor in­
teractions using sample sizes up to 160 \Theta 160 \Theta 40 sites. The HCP lattice
represents He 4 on which three roughening transitions have been observed
experimentally. Most previous simulation studies on roughening transitions
were performed for other lattices where less experimental data is available.
We measured roughening temperatures for these three surfaces as a function
of higher neighbor interactions of both signs. We also measured the surface
tension of the three facets. In most cases good qualitative (and reasonable
quantitative) agreement with experiment was found with appropriate values
of interactions, confirming the basic validity of the model as applied to surface
roughening.
Typeset using REVT E X
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Source: Adler, Joan - Physics Department, Technion, Israel Institute of Technology

 

Collections: Physics