On Dec 9, 2007, at 2:27 PM, Guoying Gao wrote: > On Dec 9, 2007 9:06 PM, Stefano Baroni <baroni at sissa.it> wrote: >> Imaginary frequencies are usually a sign of a mechanical >> instability, as >> discussed many times in this forum as well as in many condensed- >> matter >> textbooks. I think the answer is yours: if you want to calculate the >> electron-phonon interaction of an instable (possibly metastable) >> phase of a >> material, please do. If instead instability is soemething that >> troubles you, >> then you better settle your troubles first. Cheers - SB > Hi Stefano, > Thanks for your reply. > I know the imaginary frequencies signifying a mechanical > instability, but I want to know whether we can calculate it or not and > is it meanful to do this?
as said, I think that only you can be the judge S. > We just want to estimate the values of Tc. > Guoying > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://www.democritos.it/mailman/listinfo/pw_forum --- Stefano Baroni - SISSA & DEMOCRITOS National Simulation Center - Trieste [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype) Please, if possible, don't send me MS Word or PowerPoint attachments Why? See: http://www.gnu.org/philosophy/no-word-attachments.html -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20071209/b9802ec8/attachment.htm
