Dear all,
I have calculated the frequencies for a structure. All frequencies were positive except for a few "extrapolated" points very close to the Gamma point which were negative in the range of -1.45 cm^-1. Due to this the dispersion curve near the Gamma point looked a bit funny (but looks pretty good elsewhere). I tried the calculations with 2 different phonon grids. Any reason why this is happening? Do i have to lower tr2_ph more (it is already 10^(-19)!) Any help would be appreciated. Elio Fed Uni of Rondonia Brazil
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