GGA-tag

Default

-

This tag was added to perform GGA calculation with pseudopotentials generated with conventional LDA reference configurations. The tag is named GGA. Possible options are

$$GGA = PW \vert PB \vert LM \vert 91 \vert PE \vert RP \vert PS$$

with the following meaning:

PB	Perdew -Becke
PW	Perdew -Wang 86
LM	Langreth-Mehl-Hu
91	Perdew -Wang 91
PE	Perdew-Burke-Ernzerhof (only VASP.4.5 and older)
RP	revised Perdew-Burke-Ernzerhof (only VASP.4.5 and older)
AM	AM05 (Ref. [49,50], VASP tests see Ref. [51])
PS	Perdew-Burke-Ernzerhof revised for solids (PBEsol, see Ref. [52])

The tags AM (AM05) and PS (PBEsol) are only supported by VASP.5.X. The AM05 functional and the PBEsol functional are constructed using different principles, but both aim at a decent description of yellium surface energies. In practice, they yield quite similar results for most materials. Both are available for spin polarized calculations.