A CROSSOVER BETWEEN 2 GROWTH UNIVERSALITY CLASSES

We investigated two simple SOS growth models where the roughness of th e profile is softened by surface relaxation or by refuse. In the first case, a particle can relax until it reaches a local minimum and this process is described by a linear equation. In the second case, a parti cle can be evaporated and this process is described by the KPZ equatio n. In this work, we have mixed both the models in the same growth proc ess. Numerical simulations in (1+1)-dimensions show a process that for short times behaves as the surface relaxation model and for intermedi ate times, behaves as the refuse model. Numerical simulations indicate for this crossover a dynamical exponent z approximate to 1.4, indicat ing that it is in the KPZ universality class.