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Surface diffusion anomaly near a substrate phase transition: H on W(100) | | Lei Cai
; M S Altman
; E Granato
; T Ala-Nissila
; S C Ying
; Xudong Xiao
; | | Date: |
3 Jun 2002 | | Journal: | Phys Rev Lett, 88 (22), 226105 | | 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. | | Source: | PubMed, pmid12059435 | | Services: | Forum | Review | Favorites | |
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