Dear All, Thank you all for your kind reply. >From all of your reply, I understood one could not know negative frequency while the phonon program is running till it's end whether it is running in parallel mode or in serial mode. I also understand one has to take precautions while running phonon calculation like reducing convergence value than normal and doing the phonon calculation for any specific q-point.
I will run the program as you all suggested and report to the forum. Thank you Yours Sincerly, A.Suresh, Research Scholar, School of Physics, Madurai Kamaraj University, Madurai.
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