<div>Dear Sir/Madam</div>
<div>Please look at this paper:" <span class="journal">Phys. Rev. B</span> <span style="FONT-WEIGHT: bold" class="volume">80</span>, <span class="page">155111</span> (2009)" . It might be useful for you.</div>
<div>Regards</div>
<div>Mansoureh Pashangpour </div>
<div>Islamic Azad University</div>
<div>Tehran, Iran<br><br></div>
<div class="gmail_quote">2010/1/26 Максим Иванов <span dir="ltr"><<a href="mailto:maaaxim@yahoo.com">maaaxim@yahoo.com</a>></span><br>
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<td valign="top"><pre>Dear PW-users,<br>I would like to perform LDA+U calculations,<br>however I have some difficulties in extraction of Hubbard U.<br>As I understood there are four steps of getting this potential:<br>• Run a self consistent (unperturbed) calculation.<br>
• Starting from saved potential and wavefunction add the perturbation<br>• The response χ0 is evaluated at the first iteration (at fixed potential)<br>• The response χ is evaluated at self consistency<br>I don't actually understand how to get χ0 and χ from output file. In Ph.D thesis <br>
of Matteo Cococcioni it is said that in order to extract the Hubbard U the one needs <br>to find LDA total energy as a function of the total d level occupancy of one<br>”Hubbard” site, but I can't relate these words with output information of my calculations.<br>
<span style="FONT-STYLE: italic"><span style="FONT-STYLE: italic"><span style="FONT-STYLE: italic"><span style="FONT-STYLE: italic"><br></span></span></span></span>Thanks in advance,<br><br>Sincerely<br>Maxim<br><div class="hm">
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<div class="hm"><br>
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