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[abinit-forum] Negative phonon frequencies

From: <mozhganamini@yahoo.com>
To: forum@abinit.org
Subject: [abinit-forum] Negative phonon frequencies
Date: Sun, 12 Oct 2008 21:47:00 +0200 (CEST)

Dear all,

I have done response function1 for PbTiO3 and at the end some of my acoustic
phonon frequencies were negative. In spite of the ferroelectricity of PbTiO3,
is it a reasonable thing(soft mode)? If not, what should I do? can I solve it
maybe by increasing the number of nband?

Thanks alot in advance

Best Regards,
Mozhgan Amini

[abinit-forum] Negative phonon frequencies, mozhganamini, 10/12/2008
- Re: [abinit-forum] Negative phonon frequencies, NISHIMATSU Takeshi, 10/13/2008
- Re: [abinit-forum] Negative phonon frequencies, ธนูสิทธิ์ บุรินทร์ประโคน, 10/13/2008