<div dir="ltr"><div>Hard to say. If it happens at the first iteration with exact exchange on: there is something strange or wrong in input data. If it happens at a later stage: try to remove ecutfock (you will gain close to zero from reducing it to 380 from 440)<br><br></div>Paolo<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Nov 27, 2015 at 4:20 PM, Tiana Davide <span dir="ltr"><<a href="mailto:davide.tiana@epfl.ch" target="_blank">davide.tiana@epfl.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Paolo<br>
<br>
it is a MOF, mil-78.<br>
<br>
gamma point, lattice vector a=6.8 b=14.6, c=8,6, alpha=gamma=90, beta=107.5<br>
76 atoms, Ce,Y,C,O,H<br>
tot magnetization 1 (which is related to Ce)_<br>
nc pseudopotential ecutwfc=115, ecutrho=440, ecutfock=380<br>
grimme correction activated, vdw_corr='grimme-d2'<br>
input_dft='gaupbe',<br>
exxdiv_treatment='none'<br>
x_gamma_extrapolation = .false.<br>
<br>
Many thanks<br>
Davide<br>
------------------------------<br>
<br>
Message: 5<br>
Date: Thu, 26 Nov 2015 18:05:41 +0100<br>
From: Paolo Giannozzi <<a href="mailto:p.giannozzi@gmail.com">p.giannozzi@gmail.com</a>><br>
Subject: Re: [Pw_forum] dexx is negative also with gaupbe<br>
To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
Message-ID:<br>
<<a href="mailto:CAPMgbCuOUg%2BOS3YU2Gm8SB7TiCH9MZEAGH0OezzSvv584J7r5g@mail.gmail.com">CAPMgbCuOUg+OS3YU2Gm8SB7TiCH9MZEAGH0OezzSvv584J7r5g@mail.gmail.com</a>><br>
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<br>
What is "your system"?<br>
<br>
P.<br>
<br>
On Thu, Nov 26, 2015 at 3:39 PM, Tiana Davide <<a href="mailto:davide.tiana@epfl.ch">davide.tiana@epfl.ch</a>> wrote:<br>
<br>
> dear qers<br>
><br>
> Despite I am using gaupbe as hybrid functional thinking it still give me<br>
> the error:<br>
><br>
> Error in routine electrons (1):<br>
> dexx is negative! Check that exxdiv_treatment is appropriate for<br>
> the system<br>
><br>
> is there any way to fix this problem and having a hybrid calculation for<br>
> my systems?<br>
> could it be because I am running gamma point calculation?<br>
><br>
> Cheers<br>
> Davide<br>
><br>
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<br>
<br>
<br>
--<br>
Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone <a href="tel:%2B39-0432-558216" value="+390432558216">+39-0432-558216</a>, fax <a href="tel:%2B39-0432-558222" value="+390432558222">+39-0432-558222</a><br>
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</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><span><span><font color="#888888">Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone <a href="tel:%2B39-0432-558216" value="+390432558216" target="_blank">+39-0432-558216</a>, fax <a href="tel:%2B39-0432-558222" value="+390432558222" target="_blank">+39-0432-558222</a></font></span></span></div></div></div></div>
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