lammps/examples/USER/atc/elastic/Ar_CauchyBornLinear.mat

material Ar real
  stress  cauchy-born
    pair_style lj/cut 13.5   #pair_style lj/cut r_cut
    pair_coeff 0.238 3.405   #pair_coeff epsilon sigma
    linear
  end
  mass_density
  body_force
end