Subject: How does the Argon melting temperature depend on density

I am teaching thermodynamics, and together with a student we are simulating by 
Molecular dynamics the melting of Argon. In our simulation we change the 
density by change the box and fixing the number of particles. I would expect 
that the melting temperature would not change considerably, but we are seeing a 
quite considerable change. Could you indicate some reference. Thanks in advance.

Re: How does the Argon melting temperature depend on density