<div dir="ltr">I have repeated the calculations many times but could not get the comparable values. Although change of XC potential provides C44 values very close to that of experimental study but other elastic constants C11, C12 deviates widely. As I am doing first time such calculations so do not have much idea how to work in right direction.<div><br></div><div>Waiting for suggestions </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 11, 2015 at 6:59 AM, Muhammad Sajjad <span dir="ltr"><<a href="mailto:sajjadpu@gmail.com" target="_blank">sajjadpu@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear P. Bala<div>I did not select the spin. sometime I got negative values. What number of k-points i should select then? </div><div>Kind regards</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 11, 2015 at 5:18 AM, Peter Blaha <span dir="ltr"><<a href="mailto:pblaha@theochem.tuwien.ac.at" target="_blank">pblaha@theochem.tuwien.ac.at</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Did you make a spin-polarized calculation ???<br>
C44 gets soft without magnetism (phase transition to non-magnetic fcc/hcp Fe)<br>
<br>
And 3000k (in the full BZ) for Fe ??? Very inaccurate.<br>
<br>
Am 10.01.2015 um 18:42 schrieb Muhammad Sajjad:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
Dear Users<br>
<br>
I am using WINE2K 11 version and computing elastic constants for Fe.<br>
<br>
The computed elastic constants are<br>
c11 = 304.760951<br>
c12 = 118.317319<br>
c44 = 367.255487<br>
<br>
I want to compare these values with<br>
C11 = 297.83 GPa, C12 = 141.89 GPa, C144 = 106.73 GPa<br>
<br>
Please suggest the possible solution. I have used 3000 as well as 5000 k-points. In all kinds of calculation, the potential WC.GGA is used. Also I used the structure<br>
(attached here with) downloaded from COD crystallography site.<br>
True Regards<br>
Dr. Sajjad<br>
<br>
<br></div></div><span>
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