Dear Sir, Thank you for the suggestion. Now, I found imaginary acoustic modes (around -80 cm-1) at ambient conditions and the same closes to zero at high pressures using with out using Born effective charges ( I changed T to F and removed the charges )in .fc file. On the other side, All my frequencies are positive from ambient to entire pressures using with born effective charges.
It is bit surprising me. Am I miss some thing???? If possible please provide me the IBZ special points of BCT structure with Pwscf basis vectors for c/a > 1 with regards S. Appalakondaiah PhD Scholar University of Hyderabad
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