Phys. Rev. Lett. 90, 126102 (2003) [4 pages]Vacancy-Mediated and Exchange Diffusion in a Pb/Cu(111) Surface Alloy: Concurrent Diffusion on Two Length ScalesReceived 10 September 2002; published 24 March 2003 Pb diffuses in a Pb/Cu(111) surface alloy predominantly by exchange with surface vacancies and, much less frequently, by exchange with thermal Cu adatoms. Because the infrequent adatom exchanges transport Pb atoms much farther, both processes affect observations of Pb transport in the Pb/Cu(111) surface alloy. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.126102
DOI:
10.1103/PhysRevLett.90.126102
PACS:
68.35.Fx, 05.40.Fb, 07.79.Cz, 66.30.Jt
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