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These types specify Sutton-Chen potentials of the appropriate
form.[15]
Three additional real parameters must be specified using the PARAMS keyword
in the odata file,
namely Sutton and Chen's , and , in this order.
The nearest neighbour distance in the prevailing unit system is . Hence,
using corresponds to a unit system where the bulk nearest-neighbour distance is 1.
Subroutines used: scdiff.
David Wales
2002-10-28