<div dir="auto">I am highly dubious of +U for 4f, as it dumps them low in many cases. I suggest using -eece and (if you must) runsp_c. You can also use runsp_c with +U if you want.<br><br><div data-smartmail="gmail_signature">--<br>Professor Laurence Marks<br>Department of Materials Science and Engineering, Northwestern University<br><a href="http://www.numis.northwestern.edu">www.numis.northwestern.edu</a><br>"Research is to see what everybody else has seen, and to think what nobody else has thought" Albert Szent-Györgyi</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 20, 2023, 05:19 pluto via Wien <<a href="mailto:wien@zeus.theochem.tuwien.ac.at">wien@zeus.theochem.tuwien.ac.at</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear All,<br>
<br>
I am calculating one of the Kagome materials. It includes a 4f element.<br>
<br>
I need non-magnetic bands, because my experiments are made above the <br>
magnetic transition temperature. People typically use U around 6 eV on <br>
the 4f level for this material. I know that paramagnetic phase of <br>
local-moment 4f compound is more complicated, but people often <br>
approximate it with non-magnetic DFT bands.<br>
<br>
The problem is that without FM the 4f bands are not exchange split and <br>
they land around the Fermi level, obscuring the interesting valence <br>
bands. And with magnetic calculation (runsp) all non-4f bands are <br>
slightly exchange split, which I need to avoid.<br>
<br>
Is there a way to artificially shift the 4s level somewhere? Or just to <br>
remove them, treat them as core? I understand these kind of procedures <br>
are called the "frozen core approx.".<br>
<br>
Best,<br>
Lukasz<br>
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