<div dir="ltr"><div>The calculation of third-order force constants is done now in package "D3Q". See <a href="https://anharmonic.github.io/" target="_blank">https://anharmonic.github.io/</a>. "make d3q" should work, or at least, it used to work some time ago. <br></div><div><br></div><div>Paolo<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 18, 2021 at 3:41 PM Axel Felix Huebner <<a href="mailto:Axel.Felix.Huebner@physik.hu-berlin.de" target="_blank">Axel.Felix.Huebner@physik.hu-berlin.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear QE community,<br>
<br>
I have a question concerning the PHonon package: I did not find a <br>
documentation concerning the calculation of third order force constants <br>
via DFPT (i.e. not finite displacements).<br>
<br>
Can you tell me, where I can find this?<br>
<br>
Best<br>
Axel Huebner<br>
<br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div>Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br>Univ. Udine, via delle Scienze 206, 33100 Udine, Italy<br>Phone +39-0432-558216, fax +39-0432-558222<br><br></div></div></div></div></div>