Dear experts and users, I have used the two set of convergences 1) conv_thr=1.0d-12, tr2-ph=1.0d-18; and, 2) conv_thr=1.0d-14, tr2-ph=1.0d-20 to calculate the phonons at gamma point only. The acoustic frequencies (in Hz) for set 1) and set 2) are (-0.002956, -0.002296, -0.000000) and (-0.000229, -0.000143, 0.000000), respectively. May I consider these to be dynamically stable. Your valuable suggestions will help me to solve the problem.
Thank you!! -- With regards Anupriya Nyayban Ph.D. Scholar Department of Physics NIT Silchar
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