Thermal roughening of ${001}$ surfaces

Zandvliet, Harold J.W. and Dijk van, Frank R. and Poelsema, Bene (2005) Thermal roughening of ${001}$ surfaces. Physical Review B: Condensed matter and materials physics, 72 (11). p. 113412. ISSN 1098-0121

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Abstract:	Within the framework of a solid-on-solid model that incorporates nearest- (epsilon) and next-nearest-neighbor (delta) interactions we have determined the free energy of the high-symmetry steps on a (001) surface of a cubic crystal. We have found a simple expression that allows one to determine the thermal roughening temperature TR of a (001) surface (2e¿(epsilon/2+delta)/kbTR¿e¿(epsilon+2delta)/kbTR+2e¿(epsilon+delta)/kbTR=1). In a more refined analysis we have explicitly included step-edge overhangs. This results in a slightly lower thermal roughening temperature. Our results are also applicable to the two-dimensional Ising spin system.
Item Type:	Article
Copyright:	© 2005 The American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Interfaces and Nanomaterials (PIN)
Link to this item:	http://purl.utwente.nl/publications/53850
Official URL:	http://dx.doi.org/10.1103/PhysRevB.72.113412
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Thermal roughening of surfaces