Hello everyone, I'm trying to do phonon calculation for some hexagonal structures. Once I'm relaxing my structure up to 0.0004 eV/Ang after the first MD step of phonon calculation without any displacement the maximum force will be 0.002 eV/Ang but still there is no negative frequency. This time I've relaxed my structure up to 0.0002 eV/Ang but in the first step I'm receiving 0.015 eV/Ang which is leading to the negative frequencies. In the successful phonon calculations I just lowered the number of kpoint in the Monkhorst pack for phonon calculation but this time even the kpoints are the same as relaxation input. Any help would be appreciated
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