[Pw_forum] convergence NOT achieved, stopping(additional information)

Mahmoud Payami mpayami at aeoi.org.ir
Sun Nov 28 10:54:49 CET 2004

Dear Paolo,

Thank you very much for your advice. It works well by broadening.
With kind regards,
> from the manual:
> --
> Self-consistency is slow or does not converge.
> [...] If the highest occupied and lowest unoccupied state(s) keep 
> exchanging place during self-consistency, forget about reaching 
> convergence. A typical sign of such behavior is that the self-consistency
> error goes down, down, down, than all of a sudden up again, and so on.
> Usually one can solve the problem by adding a few empty bands and a
> broadening.
> -- 
> Paolo Giannozzi             e-mail:  giannozz at nest.sns.it
> Scuola Normale Superiore    Phone:   +39/050-509876, Fax:-563513 
> Piazza dei Cavalieri 7      I-56126 Pisa, Italy
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