SCALING IN A 2-COMPONENT SURFACE-GROWTH MODEL

We study scaling in kinetic roughening and phase ordering during growt h of binary systems. We use a 1 + 1-dimensional single-step solid-on-s olid model with Ising-like interaction between two components. We obse rved that the model exhibits a crossover from an intermediate regime, with effective scaling exponents for kinetic roughening significantly larger than for the ordinary single-step growth model, to an asymptoti c regime with exponents of the Kardar-Parisi-Zhang class. The crossove r time and length are exponentially increasing with the strength of in teraction K. For a given large K, scaling with enhanced exponents is v alid over many decades. The effective scaling exponents are continuous ly increasing with K. Surface ordering proceeds up to the crossover. T he average size of surface domains increases during growth with the ex ponent close to 1/2; the spin-spin correlation function and the distri bution of domains obey scaling with the same exponent. [SO163-1829(98) 02039-6].