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Global optimization analysis of the 38-atom sequence of CunAum (n+m=38) nanoalloy clusters was performed by means of a genetic algorithm and using the Gupta empirical potential. A subset of these global minimum structures was recalculated with more detail using density-functional theory (DFT) techniques, namely the sequence CunAu38-n with n=6,13,15,18,37. The density-functional theory analysis confirms...