[lammps-users] potential for sn

hello ,in lammps there have no sn potential now , i want to use it ,
so where i can find it and use it with lammps ,if it is possible that
i write sn potential file by myself , P.S. i open the cuu3 file,i do
not look three arrays but five arrays in data section.how i can match
the data with F(rho),Z(r),rho(r)

There are 3 arrays in the cuu3 file. The format of these
files is described in the pair_style eam doc page.
You'd have to search on the WWW for a Sn EAM potential file.