Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 20, Pages 4588-4591Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.4588
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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.
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