The number of modes at every k point must be 3*n.(n is the number of atoms) Please check your output file carefully.
On Tue, Jul 22, 2014 at 2:13 AM, Shyam Khambholja <physik.shyam at gmail.com> wrote: > Dear users, > > while calculating phonon frequencies at high pressure, some modes in optical > branches disappear. can anybody tell me why this happen ? or is it my > calculation error ? > > Thanks & regards, > > > Dr. Shyam G Khambholja, > Indus University > Gujarat > India > > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://pwscf.org/mailman/listinfo/pw_forum -- ____________________________________ Hui Wang School of physics, Henan University of Science and Technology, Henan, China
