Pseudopotential of Cerium (Ce)

[fujisaki_takaya1]

Hi

I try to understand the way to describe the electron configuration of pseudopotential of Cerium (Ce).

I found there are "Ce_h", "Ce_GW", and "Ce_3" folders in potpaw_PBE.54 folder. I think that each folder contains the electron configuration without inner core.

“Ce_h” shows [core=Xe4] s2d1f1. (However, two folders of "Ce_GW", and "Ce_3" show different one describing "[core=Kr4d]".
I am confused about the reason why there is such difference.
I think there should be purpose on each POTCAR file, but I can not get it still. Unfortunately, I could not find any answer I can understand as beginner level on any webpage.

I would appreciate if you give me some hints.
Thank you for reading

Best regards,

[ferenc_karsai]

Principally the most important difference between POTCAR files for a given atom is in the cutoff for the energy channels and the configuration of the core. For calculations where conduction band states are important (like RPA, GW etc.) more energy channels are required, hence the POTCARs named GW usually have a higher cut off.
It can be also desired that semicore states are put into valence, since semicore states can be spatially to large for the PAW spheres and inaccuracies in the calculation can occur.

[fujisaki_takaya1]

Dear ferenc_karsai

Thank you for your reply.
I try to use "Ce_GW" because of larger number of valence electrons. (I am thinking that POTCAR with "core=Kr4d" does not include electrons of Kr4d)

Can I think that POTCAR having more valence electrons generally provide more accurate results?
(Side effect is to make calculation speed slower)

If I misunderstand, I would really appreciate your advice.

Best regards,
Takaya