phonon_method

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`character(len=20) :: phonon_method`

This determines the method used to calculate the elements of the dynamical matrix. Possible values are:

FINITEDISPLACEMENT - A finite displacement method will be used to numerically approximate the dynamical matrix. N.B. This can only be used for qpoint=(0,0,0).
LINEARRESPONSE - Linear response will be used to calculate the dynamical matrix. This can be applied for arbitraty qpoint.

The alias 'DFPT' is accepted for 'LINEARRESPONSE' for the value of the PHONON/SMALL>_METHOD keyword. The parameter value will be set to 'LINEARRESPONSE' in this case.

The default value of this parameter is `LINEARRESPONSE'.

Jonathan Yates 2004-04-16