<br><br>
Dear <span id="_user_wierzbom@ts.infn.it" style="color: rgb(121, 6, 25);">Malgorzata ,<br>
<br>
It's very nice to recieve your quick reply.<br>
Thank you very much my adorable friend.<br>
<br>
</span>>>>>>>>And always k_fit/(k_phonon + q_phonon) should be the integer<br>
number.<br>
<br>
So if I use 48 48 1 for k_fit <br>
24 24 1 for k_phonon and <br>
<br>
2/3 0.0 0.0 for a special single q point (it's
not automatic generated value) <br>
Then I think it will be fine , Right???<br>
OK let me try.<br>
Regards,<br>
Amit <br>
<span id="_user_wierzbom@ts.infn.it" style="color: rgb(121, 6, 25);"><br>
<br>
</span><br><div><span class="gmail_quote">On 1/29/07, <b class="gmail_sendername">Malgorzata Wierzbowska</b> <<a href="mailto:wierzbom@ts.infn.it">wierzbom@ts.infn.it</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Mon, 29 Jan 2007, Srijan Kumar Saha wrote:<br><br><br>> Respected Users,<br>><br>> Would you like to tell me what automatic (like 48 48 1)<br>> the dense k-point grid in the first scf calculations<br>> (
i.e. scf-fit). I should use<br>> to get special q point<br>>><br>>> 0.6666667 0.0 0.0<br>>> as a the subsets of the scf-fit ????<br>> Is there any definite rule except applying a trial and
<br>> error method like 4 4 1, 6 6 1, 9 9 1, 38 38 1 etc. etc. ????<br>> Your kind help will be greatly appreciated.<br>> Regards,<br>> Amit<br>><br><br> If q=(2/3,0.0,0.0) your k-mesh for phonons and k-fit mesh
<br> should be modulo 3. So (4 4 1) and (38 38 1) are for sure bad.<br> Meshes (6 6 1) and (9 9 1) are too small, although they would<br> not give the error if your rare k-mesh (k-mesh for phonons) were<br> modulo 3.
<br> Actually, for this kind of calculations you should ask for<br> 3 meshes: k_fit, k_phonon, q_phonon.<br> And always k_fit/(k_phonon + q_phonon) should be the integer<br> number.<br><br> Gosia<br><br><br>
</blockquote></div><br>