[Pw_forum] Negative frequence at Gamma point and other kpoints.

[Paolo Giannozzi]

This question has been answered many times:
www.quantum-espresso.org/faq/phonons

Paolo

On Mon, Nov 13, 2017 at 9:18 AM, 方子明 <201721140025 at mail.bnu.edu.cn> wrote:

> Dear Experts,
> Recently, I have done some phonon calculations about NaFeAs, I noted that
> some negative frequencies appears at Gamma point.
> I have also done calculationphonon dispersion for LiFeAs, and again I
> found some negative frequencies.
> My input files are attached with mail.
> Thanking in anticipation for answering my question.
> Regards,
> Ziming Fang.
>
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-- 
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222
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