<div dir="ltr"><div>Hi,</div><div><br></div><div>Your vcrelax is not completed (only have two iterations), try to reduce ecutwfc (50 will be sufficient for vcrelax) and redo the vcrelax. Your convergence parameters are very poorly defined, go to the documentation and have a look <a href="https://www.quantum-espresso.org/Doc/INPUT_PW.html">https://www.quantum-espresso.org/Doc/INPUT_PW.html</a></div><div><br></div><div><br></div><div>Bests,<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 7, 2020 at 9:12 AM Poonam Kaushik <<a href="mailto:poonamkaushik40@gmail.com">poonamkaushik40@gmail.com</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"><div dir="ltr">Dear Sir,<div>Thank you so much for your quick response. Previously, I attached my scf input. Here, I am attaching my vc-relax calculations.<br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">-------------------------------------------------------------------------------------------------<br></div><div dir="ltr">Poonam Sharma<div>Research Scholar </div><div>Department of Physics</div><div>Indian Institute of <span>Technology Bombay</span></div><div><div>Mumbai - 400076<br></div>India.<br></div><div><br></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 7, 2020 at 1:04 AM Yuvam Bhateja <<a href="mailto:yuvamb16@gmail.com" target="_blank">yuvamb16@gmail.com</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"><div dir="auto"><div dir="auto">Mam,<div dir="auto"><br></div><div dir="auto">The input is quite confusing, you said you are performing vc-relax calculation but you are performing scf calculation while also calculating the forces.</div><div dir="auto"><br></div><div dir="auto">Plus, I have observed that your convergence threshold is quite large at 1.00000e-4, so even in optimization calculation your results won't be very accurate and fluctuate. This causes large 'Total scf correction' and causes the calculation to stop.</div><div dir="auto"><br></div><div dir="auto">Let me know if I can help further.</div><div dir="auto"><br></div><div dir="auto">Regards</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 6 Aug 2020, 11:50 pm Poonam Kaushik, <<a href="mailto:poonamkaushik40@gmail.com" rel="noreferrer noreferrer" target="_blank">poonamkaushik40@gmail.com</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"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Dear QE users,</div><div>I have been trying to perform a vc-relax calculation with 24 atoms. After two scf steps, I am not able to achieve the convergence. My scf calculation finished successfully with the forces</div><div> Total force = 0.052988 Total SCF correction = 0.001992</div> Computing stress (Cartesian axis) and pressure<br> total stress (Ry/bohr**3) (kbar) P= 19.11<br> 0.00018596 0.00000000 0.00000000 27.36 0.00 0.00<br> 0.00000000 0.00018596 0.00000000 0.00 27.36 0.00<br> 0.00000000 -0.00000000 0.00001780 0.00 -0.00 2.62<br><div><br></div><div>I tried many attempts by changing the mixing beta, mixing mode, and degauss value as suggested in the Forum. I also visualized my structure after each step. I am attaching my input file, please have a look.</div><div>I myself not able to recognize something wrong that I am doing. I'll very thankful for any suggestions. </div><div><br></div><div><br></div><div dir="ltr">------------------------------------------------------------------------------------------------<br></div><div dir="ltr">Poonam Sharma<div>Research Scholar </div><div>Department of Physics</div><div>Indian Institute of <span>Technology Bombay</span></div><div><div>Mumbai - 400076<br></div>India.<br></div><div><br><br></div></div></div></div></div></div></div></div>
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Quantum ESPRESSO is supported by MaX (<a href="http://www.max-centre.eu/quantum-espresso" rel="noreferrer" target="_blank">www.max-centre.eu/quantum-espresso</a>)<br>
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<a href="https://lists.quantum-espresso.org/mailman/listinfo/users" rel="noreferrer" target="_blank">https://lists.quantum-espresso.org/mailman/listinfo/users</a></blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr">Manoar Hossain<div>Research Scholar</div><div>School of Physical Sciences</div><div>National Institute of Science Education and Research (<span style="font-size:12.8px">NISER)</span></div><div><span style="font-size:12.8px">Bhubaneswar, Jatni, Khurda, Odisha, 752050, INDIA</span></div></div></div></div></div>