Surface diffusion anomaly near a substrate phase transition: H on W(100).
Using a linear optical diffraction method, we have experimentally studied the long predicted diffusion anomalous behavior for H/W(100) near the reconstructive phase transition of the W(100) substrate. This anomaly manifests itself in the form of a strong dip in the diffusion coefficient D at the transition temperature T(C). We interpret the strong reduction of D as a result of the diverging friction damping near the transition. The finite dip in D instead of a vanishing D at T(C) also demonstrates the importance of the non-Markovian (memory) deviation from the simple instantaneous damping picture.
Cai
Lei
L
Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, SAR, China.
Altman
M S
MS
Granato
E
E
Ala-Nissila
T
T
Ying
S C
SC
Xiao
Xudong
X