[Pw_forum] d3.x on various q-points

Hugo LEVARD hugo.levard at edf.fr
Tue Apr 9 09:07:32 CEST 2013


Dear all,

I am trying to understand an error occuring on third order anharmonic 
calculation with d3.x.
The default example works perfectly (q=(1 0 0)), but when I just change 
the q-point on which the calculation is done, I do not always get a 
result.
With, for instance, q=(0.3 0.2 0.1)
+ In version 4.3.2, the tensor components are simply "NaN".
+ In version 5.0.2, the calculation fail with an I/O error ("error in 
routine davcio").
From the panel of q -points I have tried, it seems to me that this problem 
arises when leaving the high symmetry line in the BZ.

I was wondering wheither anybody noticed such behavior, and if yes I would 
be pleased to know how to deal with it.

Best regards

Hugo Levard
IRDEP - EDF R&D
Chatou, France
hugo.levard at edf.fr


 
Hugo LEVARD
Doctorant
EDF – R&D
IRDEP - EFESE
6 Quai Watier - BP 49
78401 Chatou
 
hugo.levard at edf.fr
Tél. : 01 30 87 90 28
Fax : 01 30 87 85 65

Un geste simple pour l'environnement, n'imprimez ce message que si vous en 
avez l'utilité.




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