Phys. Rev. Lett. 86, 4588–4591 (2001)Diffusion Kinetics in the Pd/Cu(001) Surface AlloyReceived 17 November 2000; published in the issue dated 14 May 2001 We use atom-tracking scanning tunneling microscopy to study the diffusion of Pd in the Pd/Cu(001) surface alloy as a function of temperature. By following the motion of individual Pd atoms incorporated in the surface, we show that Pd diffuses by a vacancy-exchange mechanism. We measure an activation energy for the diffusion of incorporated Pd atoms of 0.88 eV, which is in good agreement with our ab initio calculated energy of 0.94 eV. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4588
DOI:
10.1103/PhysRevLett.86.4588
PACS:
68.35.Fx, 05.40.Fb, 07.79.Cz, 66.30.Jt
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