[CP2K-user] general normconserving UPF in CP2K

[Michiel van Setten]

Dear colleges,

I have been continuing on this project last weeks performing various tests. 
At present I have the feeling something is going wrong when using upf 
pseudopotentials in CP2K.

I have attached a small example on carbon that illustrates the problem. 
Both the upf from the regression tests and the upf from the pseudo dojo 
result in ridiculously large stresses, the GTH is correct, all for a 
geometry that should be the PBE groundstate geometry.

Both upfs are UPF v2.0.1.

The confusing point is that CP2K runs perfectly fine in all cases. The 
electronic structure converges rapidly an no weirdly deviating energies 
appear. 

note 1, When I run similar comparisons using CBS basis sets the results are 
similar, to me this indicates that the problem may not be causes by the 
none optimizes basis set.

note 2,  we are currently on version 5.1, I started compiling 6.1. Are 
there any relevant changes in the upf reading part between these versions?

note 3, When we were using atomic runtype with basis optimization, in an 
attempt to generate a fitting basis, cp2k tries to fit exponents to none 
existing angular momentum numbers reporting two X exponents past f:

error l value too high aobasis/ai_overlap.f 2104.

maybe this is a related problem

note 4 when the PD potential has none-linear core corrections, i.e. the tag 
core correction is T cp2k segfaults.

I hope someone may understand what is causing this behaviors.
Many thanks,
Michiel van Setten

Op maandag 17 december 2018 11:40:06 UTC+1 schreef Michiel van Setten:
>
> Dear community,
>
> I have seen some keywords concerning the use of UPF pseudo potentials in 
> CP2K, I however did not manage to figure out if this means cp2k can use 
> general normconserving UPF pseudopotentials. 
>
> I would like to make some pseudopotentials with different amounts of 
> valence electrons for some elements. Since I have some experience in 
> generating ONVPSP pseudo potentials, for me the easiest would generate 
> ONCVPSP's and use them in CP2K, either in upf format or, as a second 
> option, via a conversion into HGH format. 
>
> If any one has some experience, it would be very welcome, reasons why this 
> would be a bad idea would be equally welcome ;-)
>
> many thanks,
> Michiel van Setten
>
>
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