<div dir="ltr"><div>Maybe the same problem reported here?</div><div> <a href="https://gitlab.com/QEF/q-e/-/issues/204">https://gitlab.com/QEF/q-e/-/issues/204</a></div><div>Paolo<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 25, 2021 at 4:19 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:1773a31d564cb971f161"><br>
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<div>Thank you,</div>
<div>Xavier<br>
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