[Wien] c/a optimization

[Seyyed Amir Abbas Emami]

​dear wien2k users

I want to run c/a optimization (constant volume) on a compound which its origin structure is cubic now i have some questions:
 
 1- I know its cubic spacegroup but for c/a optimization in StructGen, i must create its tetragonal structure  or cubic space group is correct and just changing the c parameter arbitrary? And is there any further consideration?

2- 3% Rmt reduction is enough?
3- Is there any paper to help me in details about this problem. 


excuse me if i ask a simple question.I am a new man. I read some papers but i was not sure about this.

Thank you in advance
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