With this option the code computes the elastic constants for a set of
geometries, the same geometries that are chosen with the option
what='mur_lc_t', and writes them on separate files, one for
each geometry inside the directory elastic_constants. The
temperature dependence of the elastic constants is
not computed by this option. In order to plot the elastic constants
as a function of temperature it is necessary to make a calculation
with what='mur_lc_t' having on files the elastic constants
calculated with the present option. In this case thermo_pw
will be able to calculate the anharmonic properties using temperature
dependent elastic constants and bulk moduli obtained by interpolating
(within the ``quasi-static approximation") the elastic constants computed
by this option at the crystal parameters
found at each temperature from the minimization of the free energy.
The parameters that control this option are the same as those used with
what='mur_lc' for the choice of the geometries and with
what='scf_elastic_constants' for the control of the elastic
constants. Note however that only elastic_algoritm='standard'
is presently working with this option.
Number of tasks for this option: ngeo_strain times the number of
independent strains. The different geometries are computed in sequence one
after the other.