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# Example of the CP2K Phonopy interface for NaCl
To create supercells with displacements:
```console
$ phonopy --cp2k -c NaCl.inp -d --dim="2 2 2"
```
A perfect 2x2x2 supercell (`NaCl-supercell.inp`) and two 2x2x2 supercells
(`NaCl-supercell-001.inp`, resp. `NaCl-supercell-002.inp`) of the conventional
unit cell written in `NaCl.inp` are created.
In addition, `phonopy_disp.yaml` file is created.
The `amplitude` option is optionally specified for atomic displacement distance
in Angstrom. After force the calculations with the crystal structures in
NaCl-supercell-xxx.inp, it is needed to create `FORCE_SETS` file by running
```console
$ phonopy --cp2k -f NaCl-supercell-001-forces-1_0.xyz NaCl-supercell-002-forces-1_0.xyz
```
Here the XYZ files are supposed to contain the forces on atoms calculated
by CP2K. The `phonopy_disp.yaml` file has to be put in the current directory.
Now you can run phonon calculation, e.g.,
```console
$ phonopy --cp2k -c NaCl.inp -p band.conf
```
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