<div dir="ltr"><div><div>Chris,<br><br></div>If you look at any PDOS for a d atom octahedrally coordinated with oxygen, you will see e_g DOS mixed in the (filled) oxygen band DOS. e_g orbitals point at the oxygen and couple strongly with px,py,pz. Most of the e_g weight is pushed up above the crystal field gap, but a substantial part is mixed in with oxygen -- this is actually due to antibonding coupling. So it should be recognized that the weight (and charge) is there, but otherwise ignore it as a minor complication. And related: don't take "atomic" charges from DFT codes too seriously. That said, I do look at them a lot.<br><br></div>Warren<br></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div><div><br>Warren E. Pickett<br>Distinguished Professor of Physics<br></div><div>Department of Physics<br></div>University of California Davis<br></div>Davis CA 95616, USA<br></div> Cell: 530-220-2138<br></div></div></div></div></div>
<br><div class="gmail_quote">On Wed, Nov 22, 2017 at 11:00 PM, Christoph Wolf <span dir="ltr"><<a href="mailto:wolf.christoph@qns.science" target="_blank">wolf.christoph@qns.science</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">Dear all,<div><br></div><div>I have a probably silly question I cannot wrap my head around:</div><div><br></div><div>a sixfold coordinated FeO6 gives me quite nice, texbtook like crystal-field split t2g (dxz, yz, xy) and eg (z^2 x^2-y^2) orbitals after running it through projwfc. I am having a hard time interpreting the charges, however:</div><div><br></div><div><div>total charge = 14.9828, p = 5.9918, pz= 1.9973, px= 1.9973, py= 1.9973, </div><div>total charge = 14.9828, d = 6.7326, dz2= 0.4228, dxz= 1.9623, dyz= 1.9623, dx2-y2= 0.4228, dxy= 1.9623, </div><div><br></div><div>i.e. the t2g are doubly occupied but the eg have half an electron each (~1e in total) which lies above the Ef by ~0.8 eV (i.e. much higher than the broadening which was 0.005 Ry); Is this an "residual" electron from the ligand field and why is it picket up by the eg orbitals?</div><div><br></div><div>Thanks in advance for your help and time!</div><div><br></div><div>Best regards,</div><div>Chris </div><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br><div class="m_3446416256365774410gmail_signature"><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>
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