Crossover scaling in dendritic evolution at low undercooling

We examine scaling in two-dimensional simulations of dendritic growth at lo w undercooling, as well as in three-dimensional pivalic acid dendrites grow n on NASA's USMP-4 isothermal dendritic growth experiment. We report new re sults on self-affine evolution in both the experiments and simulations. We find that the time-dependent scaling of our low undercooling simulations di splays a crossover scaling from a regime different than that characterizing Laplacian growth to steady-stare growth, [S0031-9007(99)09307-2].