[QE-users] Wrong electron number in superposition of atomic charge densities
Colonna Nicola (PSI)
nicola.colonna at psi.ch
Fri Aug 28 12:37:03 CEST 2020
Dear Paolo, dear Pietro,
thank you for the quick answer and for the advise!
I'm currently trying to re-generate the pseudo with the Vanderbilt code, but facing extra complications.
I let you know if the fix works as soon as I'll be able to get the new atomic rho.
Thanks again,
Nicola
-----------------------------------------------------
PAUL SCHERRER INSTITUT
Nicola S. Colonna
WHGA/150
CH-5232 Villigen-PSI
________________________________
Da: users <users-bounces at lists.quantum-espresso.org> per conto di Pietro Davide Delugas <pdelugas at sissa.it>
Inviato: venerdì 28 agosto 2020 09:22:18
A: users at lists.quantum-espresso.org
Oggetto: Re: [QE-users] Wrong electron number in superposition of atomic charge densities
Ciao Nicola
Quick and I don't know how dirty: generate a pseudo with 12 electrons copy the rhoatom section from there and copy it in place of the 11 electrons rhoat in the pseudo you've been using.
greetings - Pietro
On 8/27/20 5:28 PM, Colonna Nicola (PSI) wrote:
Dear QE experts,
I recently perfomed a scf PBEsol calculation for Tb2Ti2O7 (attached the input file).
I would like to plot the difference between the scf charge density and the superposition
of atomic charge. For this purpose I used the PostProcessing tool (plut_num = 9).
I expected the integral of this difference to be ~0 , but I found it to be 4. After a quick check
I realized that the Ti pseudopotetial (GBRV-1.4, ti_pbesol_v1.4.uspp.F.UPF) was generated
in an ionized configuration with just 1 electron (instead of 2 ) in the 3d orbital. Since there
are 4 Ti in the primitive cell, I think this is the reason for the odd result described above.
Indeed during the initialization of a scf calculation for an isolated Ti atom I got:
Initial potential from superposition of free atoms
Check: negative starting charge= -0.001319
starting charge 10.99996, renormalised to 12.00000
However this renormalization is not done in the PP, and in any case I do not think it would make sense there.
That said, my feeling is that I cannot completely trust the charge density difference.
Do you have any advise on how to solve this problem (beside changing pseudo)?
Thank you in advance and best regards,
Nicola Colonna
-----------------------------------------------------
PAUL SCHERRER INSTITUT
Nicola S. Colonna
WHGA/150
CH-5232 Villigen-PSI
_______________________________________________
Quantum ESPRESSO is supported by MaX (www.max-centre.eu/quantum-espresso<http://www.max-centre.eu/quantum-espresso>)
users mailing list users at lists.quantum-espresso.org<mailto:users at lists.quantum-espresso.org>
https://lists.quantum-espresso.org/mailman/listinfo/users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20200828/0ea2155a/attachment.html>
More information about the users
mailing list