<div dir="ltr"><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small">Dear Xavier,</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small">I've faced the same issue a while back while using scan-rvv10. The pressure would not converge with the pseudo-potential that I was using (ONCV). For my case (<a href="https://www.mail-archive.com/users@lists.quantum-espresso.org/msg36102.html">https://www.mail-archive.com/users@lists.quantum-espresso.org/msg36102.html</a>) the issue was solved when I changed the PP to one that was built using SCAN.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small">Please try to use one of the PP found here: <a href="https://yaoyi92.github.io/scan-tm-pseudopotentials.html">https://yaoyi92.github.io/scan-tm-pseudopotentials.html</a> or even look for a PP built using PBE0.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small">Hope this helps,</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><b style="color:rgb(153,153,153);font-family:arial,sans-serif">Giovani Rech</b><br></div><div><font color="#999999" face="arial, sans-serif"><b><br></b></font><div><font color="#999999">Materials Physics and Advanced Ceramics</font></div><div><div><font color="#999999">Universidade de Caxias do Sul</font></div><div><font color="#999999">95070-560 Caxias do Sul - RS, Brazil</font></div></div></div><div><font color="#999999"><div><a href="http://orcid.org/0000-0003-0476-2056" target="_blank">orcid.org/0000-0003-0476-2056</a></div><div><br></div></font></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 25, 2021 at 12:19 PM Bidault, Xavier <<a href="mailto:xavbdlt@uic.edu">xavbdlt@uic.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Hello,</div>
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I have a molecular crystal (1 unit cell = 56 atoms). I use SG15 ONCV 1.2 pseudopotential and Grimme D2 correction.<br>
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Using vc-relax with PBE, the structure converges, no problem.</div>
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But with PBE0, density and pressure oscillate without dampening (see figure below - Pressure remains negative, and not close to zero). Is there any particular strategy with PBE0?</div>
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<li><span>vc-relax with PBE and then starting from the result and use PBE0?</span></li><li><span>relax with PBE0 and then vc-relax?</span></li><li><span>any simulation parameter to change (ion dynamics and/or cell dynamics - currently BFGS)?</span></li><li><span>any strategy with PBE0?</span></li></ul>
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<div><img size="28643" style="max-width: 100%;" src="cid:1775486a5dacb971f161"><br>
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<div>Thank you,</div>
<div>Xavier<br>
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