Dear Pwscf users, I have a question about phonon calculation. I am doing phonon of K2S (antifluorite structure), using 10x10x10 k-points mesh. In that calculations i find -ve frequencies.
But then on increasing the mesh 14x14x14 and also the kinetic energy cutoff from 32 to 38 Ry, now i am getting all the +ve freq. Can you please tell me the reason or give me some reference, so that by reading that i can understand the things. regards -- Bipul Rakshit Research Fellow, S N Bose Centre for Basic Sciences, Salt Lake, Kolkata 700 098 India
