1.
Phys Rev Lett
; 95(19): 195901, 2005 Nov 04.
Artigo
em Inglês
| MEDLINE
| ID: mdl-16383997
RESUMO
The low-temperature surface diffusion of isolated Cr adatoms on Au(111) has been determined using nonperturbing x rays. Changes in the x-ray magnetic circular dichroism spectral line shape together with Monte Carlo calculations demonstrate that adatom nucleation proceeds via quantum tunneling diffusion rather than over-barrier hopping for temperatures <40K. The jump rates are shown to be as much as 35 orders of magnitude higher than that expected for thermal over-barrier hopping at 10 K.
2.
Phys Rev Lett
; 90(14): 149703; author reply 149704, 2003 Apr 11.
Artigo
em Inglês
| MEDLINE
| ID: mdl-12731958