<div dir="ltr">Sorry, I have sent the email by accident without finishing it. <div><br></div><div>Attached (in the previous email) are the input and corresponding output files that I have used for the calculations with GAPW and GPW.</div><div><br></div><div>Yours faithfully, </div><div><br></div><div>Lucas Bandeira</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 28, 2021 at 2:45 PM Lucas Bandeira <<a href="mailto:bandeir...@gmail.com">bandeir...@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">Thank you for your reply, Fabian.<div><br></div><div>But I have performed the same kind of calculations for a Cu bulk, and the forces printed are much larger. I am attaching the input and output files. In addition, I am analyzing cutoff and relative cutoff convergence for a CO molecule. With the GPW, the printed forces were too low, but with the GAPW the forces are much higher. Could you help me with that? </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 28, 2021 at 2:09 PM Fabian Ducry <<a href="mailto:fabia...@gmail.com" target="_blank">fabia...@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>
<p>Hi Lucas</p>
<p>The forces are zero because of symmetry (the 1E-13 Ha is noise).
You should check the pressure (stress tensor) instead.
Alternatively, you can perform a volume optimization and check the
convergence of the lattice parameter wrt. k-point grid.</p>
<p>Cheers Fabian<br>
</p>
<div>On 28.06.2021 19:00, Lucas Bandeira
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Dear cp2k community,
<div><br>
</div>
<div>I am trying to analyze k-points convergence for a Au bulk,
but I am facing a problem: the atomic forces are too small.
They are of the order of 1E-13 Ha. Then, when I try to compute
the atomic forces between two consecutive grids, they are of
the order of 1E-14 Ha, much lower than the threshold I
use, 4.5E-4 Ha (the default maximum atomic force used in cp2k
geometry optimization). So basically it means that the results
will be the same no matter the k-point mesh I choose, from a
1x1x1 to a 15x15x15 mesh. Can somebody help me to solve this
problem? Attached are one of the inputs that I have used and
the corresponding output.</div>
<div><br>
</div>
<div>Yours sincerely,</div>
<div><br>
</div>
<div>Lucas Bandeira</div>
</div>
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