|RWIGS||=||values read from POTCAR|
The Wigner Seitz radius is optional. It must be supplied for each species in the POSCAR file i.e.
RWIGS = 1.0 1.5for a system with 2 species (types of atoms). If the RWIGS values is supplied and LORBIT10, the spd- and site projected wavefunction character of each band is evaluted, and the local partial DOS is calculated. If LORBIT10, RWIGS is ignored (see sections 5.16 and 5.15). RWIGS must be set in calculations with constraining the local magnetic moments (see section 6.69 For mono-atomic system RWIGS can be defined unambiguously. The sum of the volume of the spheres around each atom should be the same as the total volume of the cell (assuming that you do not have a vacuum region within your cell). This is in the spirit of atomic sphere calculations. VASP writes a line
Volume of Typ 1: 98.5 %to the OUTCAR file. You should use a RWIGS value which yields a volume of approximately .
For binary systems there is no unambiguous way to define RWIGS and several choices are possible. In all cases, the sum of the volume of the spheres should be close to the total volume of the cell (i.e the sum of the values given by VASP should be around ).