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 $ \epsilon$, $ 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.

David Wales 2018-07-21