====== LAMMPS ======
----

//potfit// supports writing the following potentials in LAMMPS format:
  * PAIR
  * EAM
  * ADP
  * Stillinger-Weber
  * Tersoff

If ''write_lammps'' is set to ''1'' in the parameter file, a potential in the corresponding [[https://lammps.sandia.gov/|LAMMPS]] format will be written in the postprocessing stage of //potfit//.

The name of the LAMMPS potential file is 
 
''<output_prefix>.lammps.<Interaction>''

e.g. ''MgZn.lammps.EAM'' for a Mg-Zn eam potential.

You also need to provide ''lammpspotsteps'' in the parameter file. The value gives the number of sampling 
points used per potential when writing the tabulated LAMMPS potential file.

----

Depending on the particular LAMMPS format, the usage of the potential might differ slightly. For details please consult the [[https://lammps.sandia.gov/doc/Commands_pair.html|LAMMPS documentation]].

Here are some examples for the different formats:

**PAIR**

PAIR potentials are written for the [[https://lammps.sandia.gov/doc/pair_table.html|table]] pair_style:

  pair_style table linear N
  pair_coeff 1 1 Li.lammps.pair lj_Li 7.0

//potfit// will automatically assign potential names based on the available data for each potential function. These can be found on top of the potential table in the LAMMPS potential file.

**EAM**

EAM potentials are written for the eam/alloy pair_style ([[https://lammps.sandia.gov/doc/pair_eam.html|DYNAMO multi-element setfl format]]):

  pair_style eam/alloy
  pair_coeff * * MgZn.lammps.eam Mg Zn