Surface diffusion anomaly near a substrate phase transition: H on W(100) |
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Authors: | Cai Lei Altman M S Granato E Ala-Nissila T Ying S C Xiao Xudong |
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Institution: | Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, SAR, China. |
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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. |
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