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AU, AG and NI

These types specify Sutton-Chen potentials of the appropriate form.[37] Three additional real parameters must be specified using the PARAMS keyword in the odata file, namely Sutton and Chen's ε, c and a, in this order. The nearest neighbour distance in the prevailing unit system is a/$\sqrt{{2}}$. Hence, using a = $\sqrt{{2}}$ corresponds to a unit system where the bulk nearest-neighbour distance is 1. Subroutines used: scdiff.