I don't understand your question. To run a problem you don't need
anything more than the EAM potential file. You can setup your
atom coords any way you like, just as you could for any other potential.
See bench/in.eam as an example for a bulk lattice. I don't know
what an "archive of atomic positions and EAM data" means.
Steve
Jonathan,
I think you are asking two questions:
1) how does lammps take care of your EAM potential file?
2) where can i find the initial configuration of my mode?
Answer below:
1) Lammps uses spline interpolation to compute "electron density,
potential energy, force, etc." at given atomic distance. You just need
to form your potential files as lammps required.
2) That's really not a Lammps question. You'll have to construct for
yourself. If you are only interested in bulk properties, Lammps can
generate fcc, bcc, hcp, diamond, etc structure. You could look at this
page:
http://lammps.sandia.gov/doc/lattice.html
Best regards,
Ajing