Volume 59, Number 2, July 2002
|Page(s)||239 - 244|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 July 2002|
Universal exponents and step-step interactions on vicinal surfaces
Institut für Schichten und Grenzflächen, ISG 3
Forschungszentrum Jülich D-52425 Jülich, Germany
2 Carnegie-Mellon University, Department of Materials Science and Engineering - Pittsburgh, PA 15213, USA
Corresponding author: email@example.com
Accepted: 17 April 2002
A 1 diameter crystallite, supported on , was equilibrated and imaged by scanning tunneling microscopy at 298. The vicinal shapes close to the (111) facet at the top of the crystal were analyzed in detail to determine the critical shape exponent and the step-step interaction energy as well as the interaction constant of the potential. An average shape exponent of 1.47 and a step interaction energy of were obtained. The exponent is very close to the theoretically predicted universal value of 3/2 and as such provides clear evidence for a dominant step interaction potential. The ratio of step free energy to step interaction energy for at 298 is .
PACS: 68.35.-p – Solid surfaces and solid-solid interfaces: Structure and energetics / 68.35.Bs – Structure of clean surfaces (reconstruction) / 68.35.Md – Surface thermodynamics, surface energies
© EDP Sciences, 2002
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