<div dir="ltr">thanks for your reply, I have used qe-5.4.0 and qe-6.0 both. but these are different, and calculation is parallelly executed . is there any other way to calculate born effective charges ? suggest me sir , thanks <br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Apr 23, 2017 at 8:25 PM, Paolo Giannozzi <span dir="ltr"><<a href="mailto:p.giannozzi@gmail.com" target="_blank">p.giannozzi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Sat, Apr 22, 2017 at 7:33 PM, VineetKumar Pandey<br>
<<a href="mailto:vineetkumar.pandey@students.iiserpune.ac.in">vineetkumar.pandey@students.<wbr>iiserpune.ac.in</a>> wrote:<br>
> sir I performed phonon calculation for monolayer PbI2<br>
<br>
</span>QE version? serial or parallel execution? it is important to know how<br>
you obtained your results.<br>
<span class=""><br>
> but I am getting born effective charges calculated by two ways<br>
</span>> (one is dF/dE and other is dP/du)<br>
<br>
the dP/du results look ok (the two I atoms have almost the same<br>
values, effective charges sum to almost 0), the dF/dE results don't.<br>
There might be a problem in this specific case.<br>
<br>
Paolo<br>
<div><div class="h5"><br>
><br>
><br>
> Effective charges (d Force / dE) in cartesian axis<br>
><br>
> atom 1 I<br>
> Ex ( -2.21984 0.00000 0.00000 )<br>
> Ey ( 0.00000 -2.21984 0.00000 )<br>
> Ez ( 0.00000 0.00000 -0.36016 )<br>
> atom 2 Pb<br>
> Ex ( 3.72748 0.00000 0.00000 )<br>
> Ey ( 0.00000 3.72748 0.00000 )<br>
> Ez ( 0.00000 0.00000 0.57697 )<br>
> atom 3 I<br>
> Ex ( -1.93678 0.00000 0.00000 )<br>
> Ey ( 0.00000 -1.93678 0.00000 )<br>
> Ez ( 0.00000 0.00000 -0.36018 )<br>
><br>
> Effective charges (d P / du) in cartesian axis<br>
><br>
> atom 1 I<br>
> Px ( -1.99748 0.00000 0.00000 )<br>
> Py ( 0.00000 -1.99748 0.00000 )<br>
> Pz ( 0.00000 0.00000 -0.30196 )<br>
> atom 2 Pb<br>
> Px ( 3.99223 0.00000 0.00000 )<br>
> Py ( 0.00000 3.99223 0.00000 )<br>
> Pz ( 0.00000 0.00000 0.60413 )<br>
> atom 3 I<br>
> Px ( -1.99741 0.00000 0.00000 )<br>
> Py ( 0.00000 -1.99741 0.00000 )<br>
> Pz ( 0.00000 0.00000 -0.30197 )<br>
><br>
><br>
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<span class="HOEnZb"><font color="#888888"><br>
--<br>
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone +39-0432-558216, fax +39-0432-558222<br>
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