Different RDF when using LJ and EAM

Dear Users,
I find it a bit weird that I get a different RDF curve when modeling gold at 500 K using lennard jones potential than when I use EAM potential. The results vary greatly. Generally, the EAM potential seems to be working right when I model gold at very high temperature quite near the melting point but below the melting point, the RDF curve computed looks very wrong. but when using the LJ potential even at low temperatures the RDF curve looks very correct to me. I would really appreciate your help here. Please find the attachment. I have attached both of the RDF curves I computed using the compute rdf command in lammps once with the EAM potential and once with LJ both at 500 K.
Sincerely,
Melika Vokhshoori

rdf-500k-EAM.xlsx (382 KB)

rdf-500k-LJ.xlsx (371 KB)

Dear Users,
I find it a bit weird that I get a different RDF curve when modeling gold
at 500 K using lennard jones potential than when I use EAM potential. The
results vary greatly. Generally, the EAM potential seems to be working
right when I model gold at very high temperature quite near the melting
point but below the melting point, the RDF curve computed looks very wrong.
but when using the LJ potential even at low temperatures the RDF curve
looks very correct to me. I would really appreciate your help here. Please
find the attachment. I have attached both of the RDF curves I computed
using the compute rdf command in lammps once with the EAM potential and
once with LJ both at 500 K.

this ​looks like your LJ system is liquid. i would not call this "wrong",
just different. question is, does the simulation behave as the physics of
its model determines?

so, what temperature range were the LJ parameters you are using ​verified
for? what was given as melting point for those parameters?
it doesn't seem very strange to me, that two potentials disagree in what
the melting point is.

axel.

p.s.: don't waste people's time, bandwidth and diskspace by attaching
gigantic excel files. a couple of graphs would have done it.​