<br>Matthias, that all makes a lot of sense. I think I will do a few formation energy comparisons at the DZV / TZV levels for my own sanity, but that's for me to worry about.<div><br></div><div>The one thing that remains is the issue of Lowdin vs Mulliken. I still have some TMOs that struggle to converge even once I switch to the SR basis sets, but work when using Lowdin+SR basis sets. Of course, Lowdin does not have forces implemented. Do you happen to know why they have yet to be implemented? Based on my knowledge, Lowdin and Mulliken are just two different ways to get q_{mu, nu}, and so I don't see why Lowdin would not be implemented and Mulliken is. If it is just a matter of effort, I might fork Cp2k and take a look at the source, but if there is a theoretical reason for it, then I won't bother.</div><div><br></div><div>Thanks for your help,</div><div>Nick</div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Thursday, April 22, 2021 at 1:28:41 PM UTC-7 Matthias Krack wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div lang="DE" link="blue" vlink="purple" style="word-wrap:break-word">
<div>
<p class="MsoNormal"><span lang="EN-GB">Nick, we are talking about dense solid state systems. For such system, space is already well covered by a DZV basis set at each atom. The situation is, however, different already for
molecular liquids like water or for systems with larger voids (MOFs, surfaces) or even small isolated molecular systems. Soft functions are required to describe the electron density decaying into the void regions. More polarisation function (second set of
d and a set of functions) certainly improve the description, but these function sets increase the computational costs significantly while their impact is rather moderate for DFT applied for O in dense solid state systems. I tried TZV/QZV and/or more polarisation
functions for O in such systems, but the gain was rather small compared to the additional computational costs. There are
<a href="https://www.cp2k.org/exercises:2015_cecam_tutorial:basis_set_optimisation_using_optimize_basis?s%5b%5d=molopt&s%5b%5d=na" target="_blank" rel="nofollow" data-saferedirecturl="https://www.google.com/url?hl=en&q=https://www.cp2k.org/exercises:2015_cecam_tutorial:basis_set_optimisation_using_optimize_basis?s%255b%255d%3Dmolopt%26s%255b%255d%3Dna&source=gmail&ust=1619484230465000&usg=AFQjCNFANp2RIygxW8NwfpPtYGYlLF9nsA">
tutorials</a> showing how you may generate new or augment existing MOLOPT basis sets. It is also important to employ a balanced set of basis sets for a system which is, of course, also true for other system types. A mixing of SR and non-SR basis sets should
always be done with care. The optimisation of the SR basis sets includes also the condition number of the overlap matrix as a parameter during the basis set generation procedure which allows for a control of its numerical stability.<u></u><u></u></span></p></div></div><div lang="DE" link="blue" vlink="purple" style="word-wrap:break-word"><div>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Matthias<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><b>Von:</b> <a href data-email-masked rel="nofollow">c...@googlegroups.com</a> <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>>
<b>Im Auftrag von </b>Nicholas Winner<br>
<b>Gesendet:</b> Donnerstag, 22. April 2021 20:34<br>
<b>An:</b> cp2k <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>><br>
<b>Betreff:</b> Re: [CP2K:15205] DFT+U unphysical warning<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
Matthias, after investigating further, it does seem like using the SR potential is fairly consistent in giving good results for the DFT+U calculations, even when Mulliken leads to a negative +U energy. I have previously not used DFT+U, and always used TZV2PX
for O finding no problems, but the population analysis does seem to require a better conditioned overlap matrix. <u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">Matt mentioned TZV-SR basis sets in the UCL file, which is true, but not for O. In fact there are a few elements which only go up to DZVP-SR across all the BASIIS_MOLOPT_{, UCL, LnPP1} files. Some of these are
O, C, Cl, F, H, etc. which are very common elements. H for instance only has SZV-SR and the rest are non-SR. If I believe that SR should always be used for stability in condensed phase, then it seems like these need some new basis sets, at least up to TZV
quality. Maybe you disagree and DZVP is sufficient for these elements for some reason, while others really need larger bases?<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Is there a reference for the procedure for fitting the SR basis sets? The molopt sets are described in "Joost VandeVondele and Juerg Hutter, J. Chem. Phys. 127, 114105 (2007)", but the BASIS_MOLOPT file simply
says "variants of these basis sets using less and thus less diffuse primitives " were used for the SR versions, which is a little bit vague to me.<u></u><u></u></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">On Thursday, April 22, 2021 at 2:18:31 AM UTC-7 Matt W wrote:<u></u><u></u></p>
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<blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class="MsoNormal" style="margin-left:35.4pt">Just to note there are MOLOPT-TZVP-SR in the BASIS_MOLOPT_UCL files distributed with CP2K.<u></u><u></u></p>
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<p class="MsoNormal" style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
Matt<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">On Wednesday, April 21, 2021 at 11:58:19 PM UTC+1
<span><a href data-email-masked rel="nofollow">n...@berkeley.edu</a></span> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">So something very strange happened.<u></u><u></u></p>
<div>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">I'm hesitant to switch O to a SR basis, because only SZV/DZVP are available. SZV isn't production quality and DZVP really isn't near the basis set limit, but I gave it a try to see what would happen. The warning
about negative DFT+U persists, but the energy changed to -15383.653493175701442. I then re-initialized with TZV2PX and converged to -15385.210534637011733. <u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">So to summarize I have three values for U=1.75<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">-15378.643602015281431 with TZV2PX<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">-15383.653493175701442 with DZVP<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">-15385.210534637011733 after restarting TZV2PX from the DZVP wfn.<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt">These are enormous differences in energy and I don't know what to make of it. Any more ideas about what is going wrong based on my inputs?<u></u><u></u></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><u></u> <u></u></p>
</div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On Wednesday, April 21, 2021 at 11:12:25 AM UTC-7 Matthias Krack wrote:<u></u><u></u></p>
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<span lang="EN-US" style="color:#1f497d">At a first glance, the basis set TZV2PX-MOLOPT-GTH-q6 for O is not well suited for condensed phase systems. You should rather use MOLOPT basis sets with “SR” in the name.</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d">HTH</span><span lang="EN-US"><u></u><u></u></span></p>
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<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
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<span lang="EN-US" style="color:#1f497d">Matthias</span><span lang="EN-US"><u></u><u></u></span></p>
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<span style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
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<b>Von:</b> <a href data-email-masked rel="nofollow">c...@googlegroups.com</a> <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>>
<b>Im Auftrag von </b>Nicholas Winner<br>
<b>Gesendet:</b> Mittwoch, 21. April 2021 19:36<br>
<b>An:</b> cp2k <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>><br>
<b>Betreff:</b> Re: [CP2K:15178] DFT+U unphysical warning<span lang="EN-US"><u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US"> <u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;margin-left:35.4pt">
<span lang="EN-US">Here is my input file for Mn3O4. <u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US">On Wednesday, April 21, 2021 at 10:30:13 AM UTC-7 Matthias Krack wrote:<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span style="color:#1f497d">Hello Nick</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d">The selection of the initial guess can help to achieve convergence. Could you provide a case which fails to converge with MULLIKEN? Otherwise, it is difficult to give further hints.</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d">Matthias</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
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<b>Von:</b> <a href data-email-masked rel="nofollow">c...@googlegroups.com</a> <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>>
<b>Im Auftrag von </b>Nicholas Winner<br>
<b>Gesendet:</b> Mittwoch, 21. April 2021 19:15<br>
<b>An:</b> cp2k <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>><br>
<b>Betreff:</b> Re: [CP2K:15176] DFT+U unphysical warning<span lang="EN-US"><u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US"> <u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US">Thanks for the reply Matthias. I've had moderate success following what you suggested.<u></u><u></u></span></p>
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<span lang="EN-US"> <u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US">One issue that still persists, however, is that for some calculations I can only get convergence by using PLUS_U_METHOD LOWDIN. For example, MnO with Ueff=1.75eV, diagonalization and small smearing (T=100). I've tried using diagonalization
and OT with MULLIKEN to get convergence, but sometimes LOWDIN seems to be the only way. Unfortunately, Lowdin does not support forces, so relaxations are out of the question. <u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US"> <u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US">Do you have a suggestion for how to work around this?<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US"> <u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;margin-left:35.4pt">
<span lang="EN-US">-Nick<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US">On Friday, April 16, 2021 at 11:00:09 PM UTC-7 Matthias Krack wrote:<u></u><u></u></span></p>
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<span lang="EN-US" style="color:#1f497d">Hello Nick</span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d">I do not recommend the use of the PLUS_U_METHOD MULLIKEN_CHARGES. Just use the PLUS_U_METHOD MULLIKEN. The Mulliken population analysis can give unphysical orbital occupations, i.e. values greater than one (UKS case)
or two (RKS case). Often the maximum occupation is only slightly exceeded and the warning can be ignored safely. You can print the orbital occupations for the orbitals affected by the +U correction with this
<a href="https://manual.cp2k.org/cp2k-8_1-branch/CP2K_INPUT/FORCE_EVAL/DFT/PRINT/PLUS_U.html" target="_blank" rel="nofollow" data-saferedirecturl="https://www.google.com/url?hl=en&q=https://manual.cp2k.org/cp2k-8_1-branch/CP2K_INPUT/FORCE_EVAL/DFT/PRINT/PLUS_U.html&source=gmail&ust=1619484230467000&usg=AFQjCNGL55CLhilAaxmJqFAC6muZVJAkQA">
print key</a> at the PRINT_LEVEL medium to check the actual occupation. Note, that the U values found appropriate with PW codes in the literature are not necessarily optimal for CP2K, too. CP2K often gives a similar effect, e.g. impact on the band gap, for
smaller U values.</span><span lang="EN-US"><u></u><u></u></span></p>
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<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d">HTH</span><span lang="EN-US"><u></u><u></u></span></p>
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<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">
<span lang="EN-US" style="color:#1f497d">Matthias</span><span lang="EN-US"><u></u><u></u></span></p>
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<span lang="EN-US" style="color:#1f497d"> </span><span lang="EN-US"><u></u><u></u></span></p>
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<b>Von:</b> <a href data-email-masked rel="nofollow">c...@googlegroups.com</a> <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>>
<b>Im Auftrag von </b>Nicholas Winner<br>
<b>Gesendet:</b> Freitag, 16. April 2021 22:57<br>
<b>An:</b> cp2k <<a href data-email-masked rel="nofollow">c...@googlegroups.com</a>><br>
<b>Betreff:</b> [CP2K:15147] DFT+U unphysical warning<span lang="EN-US"><u></u><u></u></span></p>
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<span lang="EN-US"> <u></u><u></u></span></p>
<p style="margin-left:35.4pt"><span lang="EN-US">Hello all, I am running some DFT+U calculations on Mn-O systems. While I have found a cp2k effective U value in the literature of ~1.3 eV for Mn. I notice that when tuning the value myself, I begin seeing the
following warning once the U value reaches 0.5eV.<u></u><u></u></span></p>
<p style="margin-left:35.4pt"><span lang="EN-US">*** WARNING in dft_plus_u.F:2006 :: DFT+U energy contibution is negative ***<u></u><u></u></span></p>
<p style="margin-left:35.4pt"><span lang="EN-US"> *** possibly due to unphysical Mulliken charges! <u></u><u></u></span></p>
<p style="margin-left:35.4pt"><span lang="EN-US">Now this is only a warning, not an indication that the calculation is *necessarily* wrong, but it is troubling at least. Especially when my U value is nowhere near the size of lit value. I am using PLUS_U_METHOD
MULLIKEN_CHARGES in order to have a marginally more robust solution. Does anyone have experience with how seriously to take this warning? I don't have a frame of reference to know if I should ignore it.<u></u><u></u></span></p>
<p style="margin-left:35.4pt"><span lang="EN-US"> <u></u><u></u></span></p>
<p style="margin-left:35.4pt"><span lang="EN-US">-Nick<u></u><u></u></span></p>
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