Monte Carlo Study of Ordering and Domain Growth in a Class of fcc-Alloy Models

Details Monte Carlo Study of Ordering and Domain Growth in a Class of fcc-Alloy Models Monte Carlo Study of Ordering and Domain Growth in a Class of fcc-Alloy Models

2003-03-04

arxiv.org/abs/cond-mat/0303052v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 4 figures

Scientific paper

Ordering processes in fcc-alloys with composition A_3B (like Cu_3Au, Cu_3Pd, CoPt_3 etc.) are investigated by Monte Carlo simulation within a class of lattice models based on nearest-neighbor (NN) and second-neighbor (NNN) interactions. Using an atom-vacancy exchange algorithm, we study the growth of ordered domains following a temperature quench below the ordering spinodal. For zero NNN-interactions we observe an anomalously slow growth of the domain size L(t) \sim t^\alpha, where \alpha \sim 1/4 within our accessible timescales. With increasing NNN-interactions domain growth becomes faster and \alpha gradually approaches the value 1/2 as predicted by the conventional Lifshitz-Allen-Cahn theory.

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