AVS 45th International Symposium
    Surface Science Division Thursday Sessions
       Session SS-ThP

Paper SS-ThP28
Finite-size Scaling Behavior of the Tracer Surface Diffusion Coefficient near a Second-order Phase Transition

Thursday, November 5, 1998, 5:30 pm, Room Hall A

Session: Surface Science Division Poster Session
Presenter: C. Uebing, Max-Planck-Institut fuer Eisenforschung, Germany
Authors: F. Nieto, Universidad Nacional de San Luis, Argentina
A.A. Tarasenko, National Academy of Science of Ukraine
C. Uebing, Max-Planck-Institut fuer Eisenforschung, Germany
Correspondent: Click to Email
We investigate the finite-size scaling behavior of the tracer surface diffusion coefficient in the vicinity of a second order phase transition. For this purpose, we use a lattice gas model of repulsively interacting particles on a square lattice. For all lattice sizes L studied, the measured tracer surface diffusion coefficient, D@sub t@, is a smooth function, having an inflexion point at critical temperature. Its derivative, dD@sub t@/d(1/k@sub B@T), exhibits a cusp-like maximum which is (a) sharply pronounced and (b) converged to T@sub c@ for large lattice sizes. We have analyzed the finite-size behavior of D@sub t@ and obtained its critical exponent @sigma@=0.665±0.003.