Non-Arrhenius Behavior of Surface Diffusion Near a Phase Transition Boundary

Details Non-Arrhenius Behavior of Surface Diffusion Near a Phase Transition Boundary Non-Arrhenius Behavior of Surface Diffusion Near a Phase Transition Boundary

1997-09-11

arxiv.org/abs/cond-mat/9709140v1

Phys. Rev. Lett. 79 (1997) 257

Physics

Condensed Matter

Soft Condensed Matter

4 pages, Latex with RevTeX macros

Scientific paper

10.1103/PhysRevLett.79.257

We study the non-Arrhenius behavior of surface diffusion near the second-order phase transition boundary of an adsorbate layer. In contrast to expectations based on macroscopic thermodynamic effects, we show that this behavior can be related to the average microscopic jump rate which in turn is determined by the waiting-time distribution W(t) of single-particle jumps at short times. At long times, W(t) yields a barrier that corresponds to the rate-limiting step in diffusion. The microscopic information in W(t) should be accessible by STM measurements.

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