Simmetry finder error in supercell calculations

Total energy, geometry optimization, DFT+U, spin....

Moderator: bguster

Locked
dr_sferrari
Posts: 28
Joined: Mon Mar 29, 2010 4:13 pm

Simmetry finder error in supercell calculations

Post by dr_sferrari » Tue Oct 26, 2010 7:13 pm

Dear Abiniters,
I have been trying to make positron lifetime calculations in II-VI semiconductors which have a cubic diamond/zincblend structure. I haven't have any problem until I tried to make a 2x2x2 supercell calculus. The problem appeared in the least expected way:

Code: Select all

 symfind : ERROR -
  The number of symmetries (including non-symmorphic
  translations) is larger than msym= 384
  Action : take a cell that is primitive, or at least
  smaller than the present one.

I simply do not understand why simmetry finder produces this error. I leave attached the input file used.
Attachments
vzn.in
Input file for charge density calculation in ZnSe 2x2x supercell
(3.09 KiB) Downloaded 336 times
Dr. Sergio Ferrari
Scientific Researcher (category Assistant) - CONICET (National Council of Research in Science and Technology)
IFLP (Physics Institute of La Plata)
Universidad Nacional de La Plata
La Plata, Argentina

dr_sferrari
Posts: 28
Joined: Mon Mar 29, 2010 4:13 pm

Re: Simmetry finder error in supercell calculations

Post by dr_sferrari » Tue Oct 26, 2010 7:21 pm

I have to point out that I decided to list all atoms of the unit cell (instead of the ones of the primitive cell) so to in a near future simulate vacancies or other defects
Dr. Sergio Ferrari
Scientific Researcher (category Assistant) - CONICET (National Council of Research in Science and Technology)
IFLP (Physics Institute of La Plata)
Universidad Nacional de La Plata
La Plata, Argentina

User avatar
gmatteo
Posts: 291
Joined: Sun Aug 16, 2009 5:40 pm

Re: Simmetry finder error in supercell calculations

Post by gmatteo » Fri Oct 29, 2010 3:50 pm

You have to set msym to a larger value. See the input variable

http://www.abinit.org/documentation/hel ... ml#maxnsym

Matteo

Locked