NaCl phonon calculation with DFPT functional of VASP code

POSCAR in this directory is created as SPOSCAR using the unit cell POSCAR-unitcell by

% phonopy -d --dim 2 2 2 -c POSCAR-unitcell
% phonopy -d --dim 1 1 1 -c SPOSCAR --pa auto
% mv SPOSCAR POSCAR

The second phonopy command is for making phonopy_disp.yaml corresponding to SPOSCAR

To obtain FORCE_CONSTANTS

% phonopy --fc vasprun.xml

Phonon analysis is done such as

% phonopy-load --readfc --band "0.0 0.0 0.0  0.5 0.0 0.0  0.5 0.5 0.0  0.0 0.0 0.0  0.5 0.5 0.5" -p