LNMR_SYM_RED
LNMR_SYM_RED = .TRUE. | .FALSE.
Default: LNMR_SYM_RED = .FALSE.
Description: discard symmetry operations that are not consistent with the way k-space derivatives are calculated in the linear-response calculations of chemical shifts.
The star on which the k-space derivative is calculated is oriented along the cartesian directions in k space. If the symmetry operations in k space do not map this star onto itself, erroneous results can be obtained. To check for such operations, set LNMR_SYM_RED=.TRUE.. VASP then disregards such operations, and the resulting first Brillouin zone (IBZ) is larger. This is only relevant if the use of symmetry is switched on, i.e. ISYM > 0. In case of any doubt, set LNMR_SYM_RED=.TRUE.
| Warning: It matters how the real-space-lattice vectors are set up relative to the cartesian coordinates in the POSCAR file. |
It determines the orientation of the k-space star and, hence, can affect the efficiency via the number of k-points in the IBZ.