Dear All , <br> <br>
<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">> IIRC the phonon code, and all other auxiliary codes, always print<br>
> displacement patterns, not phonon eigenvectors<br>
<br></blockquote><div> Not always, perhaps. In case of a homo-atomic system, the phonon eigen-vectots (v) <br> can directly be presented as atomic displacements (u) . However, for a hetero-<br> atomic system, it is not so straight-forward. We need some more algebra, because <br>
<br> u = v / sqrt (M) and SUM_i ( u_i . u_i . M_i ) = constant . <br><br> After that one can obtain correct atomic displacement from the eigen-vectors in case of a <br> hetero-atomic system. <br><br> Now I am going to ask here a different question. <br>
In the PWFORUM, I have found some discussions about Dario Alfe's PHON code. <br> Is here anybody who has used this code to obtain the full phonon dispersion for BaTiO3 ? <br> In the example directory of the PHON code, I find Al, and MgO as the test cases. <br>
Please do share the files for BaTiO3 as well, if available. <br> <br> Thanking you all, <br><br> Yours sincerely, <br> Suza
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