<div dir="ltr"><div>Hi Natalie,</div><div><br></div><div>I can see that you are dealing with metallic systems, and in both cases, you are using the OT method for SCF convergence, which is not recommended. For metallic systems, normally we use direct diagonalization with Fermi-Dirac smearing. You may try to replace the &SCF section of your input with the following section and see whether it works.</div><div><br></div><div>SL</div><div><br></div><div>========</div><div> &SCF<br> SCF_GUESS ATOMIC<br> EPS_SCF 1.0E-6<br> MAX_SCF 500<br> ADDED_MOS 200<br> CHOLESKY INVERSE<br> &SMEAR ON<br> METHOD FERMI_DIRAC<br> ELECTRONIC_TEMPERATURE [K] 300<br> &END SMEAR<br> &DIAGONALIZATION<br> ALGORITHM STANDARD<br> &END DIAGONALIZATION<br> &MIXING<br> METHOD BROYDEN_MIXING<br> ALPHA 0.1<br> BETA 1.5<br> NBROYDEN 8<br> &END MIXING<br> &END SCF</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 1 September 2015 at 18:14, Natalie Austin <span dir="ltr"><<a href="mailto:natalie...@gmail.com" target="_blank">natalie...@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello,<br><br>I'm fairly new to cp2k. I've been attempting to study a Nickel (and copper) cluster on a ZnO support.<br>So far using I've been able to converge the Copper cluster (~3 hrs) and the Cu on the ZnO support (~20hrs) using the input files below. However, I'm having an issue with the Nickel cluster. <br>Initially I used the same input as with the copper cluster except I changed the basis, pseudopotentials.<br>I've also I tried increasing the i) cutoff , ii) adding spin polarization with UKS and iii) UKS and changing the multiplicity.<br>However, the calculation runs for over 24 hours in each case and only performs 0-2 optimization steps. I just want to know if this is normal for a nickel system? and if there is anything else I could try to obtain convergence. <br><br>Thanks,<br><br>Natalie<span class="HOEnZb"><font color="#888888"><br><br><br></font></span></div><span class="HOEnZb"><font color="#888888">
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