[Pw_forum] Negative phonon frequencies?

Raghani Pushpa pushpa at jncasr.ac.in
Thu Oct 2 08:44:29 CEST 2003


Dear Fredric,

I was also getting the negative phonon frequencies at gamma pt for beta 
tin structure but then I found that I was using very coarse mesh for k pts 
for BZ integrations. When I increased the mesh size, the negative 
frequencies disappeared. You could try increasing the k pt mesh size.

Pushpa


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