Hi Chris,<div><br /></div><div>I am also testing the optimization of bulk Ni using your files, which are very helpful materials for me. I found that the energy converged when I directly used your input file without any changes (a 5x5x5 supercell with a multiplicity of 1001), but when I changed the supercell from 5x5x5 to others (e.g. 4x4x4, 256 atoms total) with a modified multiplicity (256*2 +1 = 513), the energy couldn't converge within 500 SCF steps. I am wondering what may cause this issue, and if you could share some thoughts.</div><div><br /></div><div>The only changes I made are the multiplicity and the multiple_unit_cell settings, I attached my input and output files for your reference. Please let me know if any concerns.</div><div><br /></div><div>Many thanks in advance,</div><div>Sincerely,</div><div>Geng</div><div><br /><div><div dir="auto">在2022年9月26日星期一 UTC-4 12:17:34<uca...@ucl.ac.uk> 写道:<br /></div><blockquote style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi Frank,<br /><br />I attach files where I have converged a spin moment of 0.72 in 36 SCF steps for your 5x5x5 supercell.<br /><br />Indeed, Ni should be ferromagnetic and we can confirm this by converging a solution with a multiplicity of 1 and comparing this to the ferromagnetic solution with a multiplicity of 500*2+1=1001. The latter is -84660.541395560532692--84661.817516270704800=1.3 Ha or 35 eV lower in energy.<div><br /></div><div>Hope this helps, <br />Chris<br /><br /><br /><br /></div><div><div dir="auto">On Sunday, 25 September 2022 at 19:28:54 UTC+1 <a href="" rel="nofollow">mdsimula...@gmail.com</a> wrote:<br /></div><blockquote style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hello,<div><br /></div><div>I am attempting an optimization of bulk nickel in a 5x5x5 super cell. Nickel is supposed to be ferromagnetic so I'm wondering how I set the appropriate magnetization for each Ni?</div><div><br /></div><div>Based on literature, the magnetization should be ~0.64. </div><div><br /></div><div>Do I need to set some crazy high multiplicity and the magnetization in the kind section?</div><div><br /></div><div>My initial input is attached.</div><div><br /></div><div>Thanks,</div><div>Frank</div></blockquote></div></blockquote></div></div>
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