<div dir="ltr"><div>I think it is difficult to provide a sharp answer. Could you please provide the working and the failing inputs to try to check what's going on?</div><div>Giovanni</div><div><br></div><div>PS being a convergence issue, the pseudopotentials you use (if not downloadable from the QE web site) would be also desirable.</div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><span style="color:rgb(0,0,0)">-- <br><br>Giovanni Cantele, PhD<br>CNR-SPIN<br>c/o Dipartimento di Fisica<br>Universita' di Napoli "Federico II"<br>Complesso Universitario M. S. Angelo - Ed. 6<br>Via Cintia, I-80126, Napoli, Italy<br><a href="mailto:giovanni.cantele@spin.cnr.it" style="color:rgb(17,85,204)" target="_blank">e-mail: giovanni.cantele@spin.cnr.it</a><br>Phone: +39 081 676910<br>Skype contact: giocan74<br><br>ResearcherID: <a href="http://www.researcherid.com/rid/A-1951-2009" style="color:rgb(17,85,204)" target="_blank">http://www.researcherid.com/rid/A-1951-2009</a><br>Web page: </span><a href="https://sites.google.com/view/giovanni-cantele/home" style="color:rgb(17,85,204)" target="_blank">https://sites.google.com/view/giovanni-cantele/home</a><br></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Il giorno lun 5 mag 2025 alle ore 23:26 Ian Dunn via users <<a href="mailto:users@lists.quantum-espresso.org">users@lists.quantum-espresso.org</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg1031053592745550677">
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<p class="MsoNormal"><span style="font-size:11pt">Hi all,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">I’ve been able to run an SCF calculation on an 8 atom unit cell successfully. The unit cell is highly symmetric with an NaCl-like geometry. However, when I displace one of the atoms by a small amount (~0.01
Angstroms) the calculation no longer converges. I also find that if I set nosym=.true. with the default perfectly symmetric coordinates the calculation also fails to converge. Finally, if I increase ecutwfc the SCF converges a bit better but not all the way
to 1e-6. Any ideas on how breaking/removing symmetry can cause SCF to not converge?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">Best regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">Ian Dunn (he/him)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">ASML Wilton MDEV Analysis Architect</span><span style="font-size:11pt"><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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