[Wien] electronoccupancy in dmatup/dn

[Peter Blaha]

I guess you should first "understand" the results of a calculation, 
before you start to experiment with more complicated tasks.

After runsp_lapw  you saved the calculation.
What was the result of this calculation ??? Was it an insulator ??
Did you plot a DOS (also partial DOS including U-f states ?
Where are the 5f states ?
What was the occupation of the U-5f states (:QTL0XX line in the saved 
scf file).

If even a GGA calculation gives "zero" (or very small) 5f occupation, a 
GGA+U calculation can ONLY give you even smaller occupation, since a 
filling of less than 0.5 e/orbital will shift these states further up 
with GGA+U.
How much did the gap change with U ??
How are the occupations ??

I don't think that at least for your U6+ there is anything to play.

For the U+5 it could be different, but again, first one would need more 
info in order to be able to guide you.

Am 31.07.2019 um 18:27 schrieb prasad jayasena:
> Dear experts
> 
> I am trying a test case to learn the correct procedure to check local minima.
> Dear experts
> 
> I am sending this followup questions related to my previous post on " electron occupancy in dmatup/dn" in the mailing list.
> 
> 
> In the firt step I finished a "runsp_lapw" and saved. I checked case.dmatup/dn and they were empty.
> Then "runsp_lapw -orb -dm" is employed.
> 
> the dmatup/dn both have values similar to the one in my previous email. I believe this work flow is corresponding to a random localization.
> 
> I appreciate your support on following questions:
> 
> (1)
> If I want to fix initial density matrix, is this the correct place to do it? Is the only file I have to edit case.dmatup/dn?
> 
> Or,  do I have to do that without trying a random PBE+U as I have done? But in that case since the case.dmatup/dn from PBE is empty, I wonder how to create that file correctly.
> 
> (2)
> If I need to include Spin orbital coupling, how I should proceed after this?
> 
> (3)
> In my case I expected to have d-orbital electrons. But I do not see them in the case.dmatup/dn. Are there any special flow to find d-matrix in the output?
> 
> Thank you in advance
> 
> Prasad
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Peter BLAHA, Inst.f. Materials Chemistry, TU Vienna, A-1060 Vienna
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