<div dir="ltr">I think U should stay the same because U is the interaction parameter. The correction to the total DFT energy due to the on-site repulsion is U\sum n_{m\sigma} n_{m'\sigma'}-double counting, if I remember it correctly. So even if we use the same U for both spin channels, the spin-up electron and spin-down electron would still be under different effective field, i.e. the intraatomic correlation are different for different spins. This is my understanding, which may be incorrect.<div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 28, 2015 at 12:09 PM, delamora <span dir="ltr"><<a href="mailto:delamora@unam.mx" target="_blank">delamora@unam.mx</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Dear WIEN2k community,</p>
<p> I have a discussion with my Professor, John B Goodenough, and I would like to share with you.</p>
<p> Is the U or the effective U (U-J) the same for up and down spin?</p>
<p> We are working in ruthenates and in some cases they are half metals, so the mobility of the up and down spins is different so the intraatomic correlation should be also different.</p>
<p> Yours</p>
<p><br>
</p>
<p> Pablo de la Mora<br>
</p>
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