<div dir="ltr"><pre style="color:rgb(0,0,0)">Dear Sir,
</pre><pre style="color:rgb(0,0,0)">I Completed the Phonon calculations with IBRAV=7 option...Its quite difficult to reperform the calculations. Can you please provide the IBZ path or source for obtain the IBZ???</pre><pre style="color:rgb(0,0,0)">with regards</pre><pre style="color:rgb(0,0,0)">S. Appalakondaiah</pre><pre style="color:rgb(0,0,0)">PhD student</pre><pre style="color:rgb(0,0,0)">University of Hyderabad</pre><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 16, 2014 at 1:22 AM, Kondaiah Samudrala <span dir="ltr"><<a href="mailto:konda.physics@gmail.com" target="_blank">konda.physics@gmail.com</a>></span> wrote:<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear all,<div><br></div><div>I am still confused with notation of Ibrav=7 in pwscf. The IBRV=7 primitive cell vectors in pwscf are quite different from any other. See below for two cases of primitive vectors IBRAV=7</div><div><b>Case1</b></div><div>For. e.g. In pwscf primitive vectors of IBRV=7 are</div><div><div> crystal axes: (cart. coord. in units of a)</div><div> a(1) = ( 0.500000 -0.500000 c/a) </div><div> a(2) = ( 0.500000 0.500000 c/a ) </div><div> a(3) = ( -0.500000 -0.500000 c/a ) </div></div><div><b>Case 2</b></div><div>On the other hand, generally people used as (from published papers)</div><div> crystal axes: (cart. coord. in units of a)<br></div><div><div><div> a(1) = ( -0.500000 0.500000 c/a) </div><div> a(2) = ( 0.500000 -0.500000 c/a ) </div><div> a(3) = ( 0.500000 0.500000 -c/a ) .</div></div></div><div><br></div><div>This variation leads to changes in reciprocal vectors and then IBZ path. From Wikipedia (<a href="http://www.sciencedirect.com/science/article/pii/S0927025610002697" target="_blank">http://www.sciencedirect.com/science/article/pii/S0927025610002697</a>) and <u><a href="http://www.cryst.ehu.es/" target="_blank">http://www.cryst.ehu.es/</a> , </u>I obtained the IBZ path for <b>case 2. But, </b>what about the IBZ path of <b>case 1 primitive cell vectors</b>?? Is both are same ??? But Xcrysden showing something else than regular Gamma, Z, Sigma, P and N points .</div><div><br></div><div><pre style="color:rgb(0,0,0)"><pre><font face="arial, helvetica, sans-serif">I feel puzzled, would some one give some idea about this? any help will be appreciated</font></pre><pre><font face="arial, helvetica, sans-serif">with regards</font></pre></pre></div><span style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)">S. Appalakondaiah</span><br><span style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)">PhD Student</span><div><span style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)">University of Hyderabad</span><div><pre style="color:rgb(0,0,0)"><pre><font face="arial, helvetica, sans-serif"><br></font></pre></pre></div><div><br></div><div><br></div><div><br></div></div></div>
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