<div dir="ltr">Hi Peshal,<div><br></div><div>You can play with the following four parameters; <span style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px">cut off (ecutwfc and hence ecutrho), conv_thr, </span><span style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px">k mesh, and mixing_beta. Usually, </span><span style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px">I ignore this warning and should not cause a problem if it is not present in the last step of the scf calculation.</span></div><div><span style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px"><br></span></div><div><span style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px">Best,</span></div><div><span style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px">Hari Paudyal</span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 12, 2020 at 3:28 PM Peshal Karki <<a href="mailto:karkipeshal@gmail.com">karkipeshal@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">Hello,<div>I was doing an nscf calculation after getting a smooth output from scf calculation of cubic CsPbI3 structure. But I encountered an error in the output file of nscf calculation as below.</div><div><br></div><div> Error in routine c_bands (1):<br> too many bands are not converged<br></div><div><br></div><div>Then I tried increasing ecutwfc value and decreasing conv_thr but it did not help. Then I changed the diagonalization from 'david' to 'cg'. Though it finished the nscf calculation and showed the Fermi energy but still many lines in output saying </div><div> </div><div> c_bands: 2 eigenvalues not converged<br> c_bands: 3 eigenvalues not converged<br> c_bands: 3 eigenvalues not converged<br> c_bands: 2 eigenvalues not converged<br> c_bands: 2 eigenvalues not converged<br> c_bands: 2 eigenvalues not converged<br> c_bands: 2 eigenvalues not converged<br> c_bands: 2 eigenvalues not converged<br> c_bands: 4 eigenvalues not converged<br> c_bands: 2 eigenvalues not converged<br></div><div><br></div><div>Please help me. What should I do ? </div><div>I have attached the nscf input file with cg diagonalisation.</div><div><br></div><div>Thank you.</div><div><br></div><div>With regards</div><div>Peshal Karki</div><div><br></div><div><br></div></div>
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