[Pw_forum] symmetry selection in CELL_PARAMETERS
giannozz at nest.sns.it
Mon Dec 4 11:32:25 CET 2006
On Dec 4, 2006, at 7:57 , W. YU wrote:
> 1. I tried to do a antiferromegnetic calculation. I know it is an
> with a small gap, but for such a calcultion, I have to add smearing
> to change the occupancy of the electrons in order for the code to
> Am I doing it right or there is an alternative ?
there are many alternatives, but smearing works for both metals
and insulators, if properly chosen (i.e. small for insulators)
> 2. I tested calculating the elastic constants using stain-energy
> with pwscf. I set the ibrav=0 and provided the additional card
> CELL_PARAMETERS. But there is a symmetry selection for this card.
> Either CUBIC or HEXGONAL. I know the symmetry before applying the
> strain (say cubic).
then there is no problem: after applying a strain, the symmetry
group will be a subgroup of the unstrained symmetry group
Paolo Giannozzi, Democritos and University of Udine, Italy
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