title: Surface diffusion anomaly near a substrate phase transition: H on W(100).
abstract: 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.
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, SAR, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Cai
authors.forename: M S
authors.initials: MS
authors.lastname: Altman
authors.forename: E
authors.initials: E
authors.lastname: Granato
authors.forename: T
authors.initials: T
authors.lastname: Ala-Nissila
authors.forename: S C
authors.initials: SC
authors.lastname: Ying
authors.forename: Xudong
authors.initials: X
authors.lastname: Xiao