Hi

I tried to perform phonon calculations. Here are the following INCAR parameters:

#########

ALGO = n

PREC = Accurate

IALGO = 38

LREAL = .False.

ENCUT = 550

ISMEAR = 0

SIGMA = 0.1

NELM = 60

NELMIN = 6

EDIFF = 1.0E-07

LWAVE = .FALSE.

LCHARG = .FALSE.

GGA = PS (#For solid-state material)

IVDW = 12 (#Since hydrides are present)

IBRION = 6

NSW = 0

ADDGRID = .TRUE.

EDIFFG = -0.005

NFREE = 2

NCORE = 24

########

I created a 2x2x2 supercell for the system. But I am getting some negative frequency lines in the phonon graph. Can you suggest where I am making mistakes?

Thanks

Regards,

Kshitij

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