Scanning tunneling microscopy of equilibrium crystal shape of Pb particles: test of universality

Small Pb crystallites equilibrated on Cu(111) and Ru(001) substrates were imaged by scanning tunneling microscopy. The curved crystal shape near a Pb(111) facet was analyzed in detail to determine the critical exponent. The results show that the exponent varies with azimuthal angle between 1.4 and 1...

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Bibliographic Details
Published inSurface science Vol. 417; no. 2; pp. L160 - L165
Main Authors Arenhold, K., Surnev, S., Coenen, P., Bonzel, H.P., Wynblatt, P.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 20.11.1998
Amsterdam Elsevier Science
New York, NY
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Summary:Small Pb crystallites equilibrated on Cu(111) and Ru(001) substrates were imaged by scanning tunneling microscopy. The curved crystal shape near a Pb(111) facet was analyzed in detail to determine the critical exponent. The results show that the exponent varies with azimuthal angle between 1.4 and 1.7. Both this variation and the shape of the (111) facet exhibit a threefold symmetry. The lower exponent of 1.4 corresponds to the directions with B-steps, characterized by (111)-type ledges. The higher exponent of 1.7, corresponding to A-steps, suggests long-range interactions between these steps. Thus, the transition of facet to curved surface near (111) does not exhibit a universal shape, in the sense of the Pokrovsky–Talapov universality class.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0039-6028
1879-2758
DOI:10.1016/S0039-6028(98)00738-9