<div dir="ltr"><div>There is a simple routine in CP that estimates the amount of "spin contamination": CPV/src/spinsq.f90. Hope this helps (but I am not sure it will!)<br></div><div><br></div><div>Paolo<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jul 26, 2020 at 8:36 AM Christoph Wolf <wolf.christoph@qns.science> 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 all,<div><br></div><div>I am navigating in circles here, I hope someone can "kick" me in the right direction ;)</div><div><br></div><div>When estimating the "spin-contamination" literature (e.g. JP Malrieu, Chem Rev 2014, 114, 429 ff) mentions that the degree of contamination is estimated by the deviation of <BS|S^2|BS> and <HS|S^2|HS> from their ideal (Ising wave-function type) values. I have a system in which the two spin-centers seem spatially well-separated and indeed I find that the LDOS indicates negligible overlap of the magnetic orbitals on the two centers. However I also wanted to check if the Noodleman condition is satisfied, e.g. if <S^2>_{HS}-<S^2>_{BS}~(S_max)^2.</div><div><br></div><div>However, I can't figure out if this is calculated in PWSCF at some point? Or does literature suggest to calculate this "by hand" possibly from the output of the Hubbard U routine where I have account of the individual electrons?</div><div><br></div><div>Any help is appreciated, have a great weekend!</div><div><br></div><div>Best,</div><div>Chris <br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr">Postdoctoral Researcher<br>Center for Quantum Nanoscience, Institute for Basic Science<br>Ewha Womans University, Seoul, South Korea<blockquote type="cite" style="font-size:12.8px"><div dir="ltr"><div><div dir="ltr"></div></div></div></blockquote></div></div></div></div>
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