GGA: Difference between revisions

Latest revision as of 15:20, 19 December 2024

GGA = PE | RP | PS | AM | LIBXC | ...

Default: The functional specified by LEXCH in the POTCAR if METAGGA and XC are also not specified.

Description: Selects a LDA or GGA exchange-correlation functional.

Important: VASP recalculates the exchange-correlation energy inside the PAW sphere and corrects the atomic energies given by the POTCAR file. For this to work, the original LEXCH tag must not be modified in the POTCAR file.

Mind:

When the OR, BO, MK, ML or CX GGA is used in combination with the nonlocal vdW-DF functional of Dion et al.^[1], the GGA component of the correlation should in principle be turned off with AGGAC=0 (see nonlocal vdW-DF functionals).
The XC tag, available since VASP.6.4.3, can be used to specify any linear combination of LDA, GGA and METAGGA exchange-correlation functionals.

Available functionals

This table lists the LDA and GGA functionals available in VASP. The names of functionals which end with "_X" and "_C" correspond to exchange-only and correlation functionals, respectively.

GGA=	Type	Description
LIBXC (or LI)	LDA/GGA	Any LDA or GGA from the external library Libxc.^[2]^[3]^[4] It is necessary to have Libxc >= 5.2.0 installed and VASP.6.3.0 or higher compiled with precompiler options. The LIBXC1 and LIBXC2 tags (where examples are shown) are also required.
CA (or PZ)⁽¹⁾	LDA	Slater exchange^[5] + Perdew-Zunger parametrization of Ceperley-Alder Monte Carlo correlation data.^[6]^[7]
PW92⁽¹⁾	LDA	Slater exchange^[5] + Perdew-Wang parametrization of Ceperley-Alder Monte Carlo correlation data.^[6]^[8]
SL⁽¹⁾	LDA	Slater exchange only.^[5] Available since VASP.6.4.3.
CA_C (or PZ_C)	LDA	Correlation-only Perdew-Zunger parametrization of Ceperley-Alder Monte Carlo correlation data.^[6]^[7] Available since VASP.6.4.3.
PW92_C	LDA	Correlation-only Perdew-Wang parametrization of Ceperley-Alder Monte Carlo correlation data.^[6]^[8] Available since VASP.6.5.0.
VW⁽¹⁾	LDA	Slater exchange^[5] + Vosko-Wilk-Nusair correlation (VWN5).^[9]
HL⁽¹⁾	LDA	Slater exchange^[5] + Hedin-Lundqvist correlation.^[10]
WI⁽¹⁾	LDA	Slater exchange^[5] + Wigner correlation^[11] (Eq. (3.2) in Ref. ^[12]).
PE	GGA	Perdew-Burke-Ernzerhof (PBE).^[13]
PBE_X	GGA	Exchange-only Perdew-Burke-Ernzerhof.^[13] Available since VASP.6.4.3.
PBE_C	GGA	Correlation-only Perdew-Burke-Ernzerhof.^[13] Available since VASP.6.4.3.
RE	GGA	Revised PBE from Zhang and Yang (revPBE).^[14]
RP	GGA	Revised PBE from Hammer et al. (RPBE).^[15]
PS	GGA	Revised PBE for solids (PBEsol).^[16]
AM	GGA	Armiento-Mattsson (AM05).^[17]^[18]^[19]
91⁽¹⁾	GGA	Perdew-Wang (PW91).^[20]
B3⁽¹⁾	GGA	B3LYP^[21] with VWN3^[9] for LDA correlation.
B5⁽¹⁾	GGA	B3LYP^[21] with VWN5^[9] for LDA correlation.
OR⁽²⁾	GGA	optPBE exchange^[22] + PBE correlation.^[13]
BO⁽²⁾	GGA	optB88 exchange^[22] + PBE correlation.^[13] PARAM1=0.1833333333 for $\beta$ and PARAM2=0.22 for $\mu$ also need to be specified.
MK⁽²⁾	GGA	optB86b exchange^[23] + PBE correlation.^[13] The PARAM1 and PARAM2 tags can be used to modify the parameters $\mu$ and $\kappa$ , respectively.
ML⁽²⁾	GGA	PW86R exchange^[24] + PBE correlation.^[13]
CX⁽²⁾	GGA	CX (LV-PW86r) exchange^[25] + PBE correlation.^[13]
BF	GGA	BEEF (requires VASP compiled with -Dlibbeef).^[26]

(1) The Slater LDA exchange includes relativistic effects.^[27]

(2) The exchange component was designed in particular to be used as the exchange component of Nonlocal vdW-DF functionals and with AGGAC=0 such that only LDA is used for the local correlation, see list of nonlocal vdW-DF functionals.

References

[dion:prl:2004-1] M. Dion, H. Rydberg, E. Schröder, D. C. Langreth, and B. I. Lundqvist, Phys. Rev. Lett. 92, 246401 (2004).

[marques:cpc:2012-2] M. A. L. Marques, M. J. T. Oliveira, and T. Burnus, Comput. Phys. Commun., 183, 2272 (2012).

[lehtola:sx:2018-3] S. Lehtola, C. Steigemann, M. J. T. Oliveira, and M. A. L. Marques, SoftwareX, 7, 1 (2018).

[libxc-4] ttps://libxc.gitlab.io

[dirac:mpcps:1930-5] ↑ ^a ^b ^c ^d ^e ^f P. A. M. Dirac, Math. Proc. Cambridge Philos. Soc. 26, 376 (1930).

[ceperley1980-6] D. M. Ceperley and B. J. Alder, Phys. Rev. Lett. 45, 566 (1980).

[perdewzunger1981-7] J. P. Perdew and A. Zunger, Phys. Rev. B 23, 5048 (1981).

[perdew1992-8] J. P. Perdew and Y. Wang, Phys. Rev. B 45, 13244 (1992).

[vosko1980-9] S. H. Vosko, L. Wilk, and M. Nusair, Can. J. Phys. 58, 1200 (1980).

[hedin1971-10] L. Hedin and B. I. Lundqvist, J. Phys. C 4, 2064 (1971).

[Wigner:tfs:1938-11] E. Wigner, Trans. Faraday Soc. 34, 678 (1938).

[pines:ssp:1955-12] D. Pines, in Solid State Physics, edited by F. Seitz and D. Turnbull (Academic, New York, 1955), Vol. I, p. 367.

[perdew:prl:1996-13] ↑ ^a ^b ^c ^d ^e ^f ^g ^h J. P. Perdew, K. Burke, and M. Ernzerhof, Phys. Rev. Lett., 77, 3865 (1996).

[zhang1998-14] Y. Zhang and W. Yang, Phys. Rev. Lett. 80, 890 (1998).

[hammer1999-15] B. Hammer, L. B. Hansen, and J. K. Nørskov, Phys. Rev. B 59, 7413 (1999).

[perdew:prl:2008-16] J. P. Perdew, A. Ruzsinszky, G. I. Csonka, O. A. Vydrov, G. E. Scuseria, L. A. Constantin, X. Zhou, and K. Burke, Phys. Rev. Lett. 100, 136406 (2008).

[armiento:prb:05-17] R. Armiento and A. E. Mattsson, Phys. Rev. B 72, 085108 (2005).

[mattson:jcp:08-18] A. E. Mattsson, R. Armiento, J. Paier, G. Kresse, J. M. Wills, and T. R. Mattsson, J. Chem. Phys. 128, 084714 (2008).

[mattson:prb:09-19] A. E. Mattsson and R. Armiento, Phys. Rev. B 79, 155101 (2009).

[perdew:prb:1991-20] J. P. Perdew, J. A. Chevary, S. H. Vosko, K. A. Jackson, M. R. Pederson, D. J. Singh, and C. Fiolhais, Phys. Rev. B 46, 6671 (1992).

[stephens:jpc:1994-21] P. J. Stephens, F. J. Devlin, C. F. Chabalowski, and M. J. Frisch, J. Phys. Chem. 98, 11623 (1994).

[klimes:jpcm:2010-22] J. Klimeš, D. R. Bowler, and A. Michaelides, J. Phys.: Condens. Matter 22, 022201 (2010).

[klimes:prb:2011-23] J. Klimeš, D. R. Bowler, and A. Michaelides, Phys. Rev. B 83, 195131 (2011).

[lee:prb:2010-24] K. Lee, E. D. Murray, L. Kong, B. I. Lundqvist, and D. C. Langreth, Phys. Rev. B 82, 081101(R) (2010).

[berland:prb:2014-25] K. Berland and P. Hyldgaard, Phys. Rev. B 89, 035412 (2014).

[beef2012-26] J. Wellendorff, K. T. Lundgaard, A. Møgelhøj, V. Petzold, D. D. Landis, Jens K. Nørskov, T. Bligaard, and K. W. Jacobsen, Phys. Rev. B 85, 235149 (2012).

[macdonald:jpc:1979-27] A. H. MacDonald and S. H. Vosko, A relativistic density functional formalism, J. Phys. C 12, 2977 (1979).

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@@ Line 1: / Line 1: @@
-{{TAGDEF|GGA|91 {{!}} PE {{!}} RP {{!}} PS {{!}} AM| exchange-correlation functional in accordance with the {{FILE|POTCAR}} file}}
+{{TAGDEF|GGA|PE {{!}} RP {{!}} PS {{!}} AM {{!}} LIBXC {{!}} ...}}
-Description: {{TAG|GGA}} specifies the GGA or LDA exchange-correlation functional one wishes to use.
+Default: The functional specified by {{TAG|LEXCH}} in the {{FILE|POTCAR}} if {{TAG|METAGGA}} and {{TAG|XC}} are also not specified.
+Description: Selects a LDA or GGA [[Exchange-correlation_functionals|exchange-correlation functional]].
 ----
-This tag was added to perform GGA calculation with pseudopotentials generated with conventional LDA reference configurations.
+<!--
+This tag was added to perform GGA calculations with pseudopotentials generated with conventional LDA reference configurations.
+-->
 {{NB| important| VASP recalculates the exchange-correlation energy inside the PAW sphere and corrects the atomic energies given by the {{FILE|POTCAR}} file. For this to work, the original LEXCH tag must not be modified in the {{FILE|POTCAR}} file.}}
+{{NB|mind|
+*When the OR, BO, MK, ML or CX GGA is used in combination with the nonlocal vdW-DF functional of Dion ''et al.''{{cite|dion:prl:2004}}, the GGA component of the correlation should in principle be turned off with {{TAG|AGGAC}}{{=}}0 (see {{TAG|nonlocal vdW-DF functionals}}).
+*The {{TAG|XC}} tag, available since VASP.6.4.3, can be used to specify any linear combination of LDA, {{TAG|GGA}} and {{TAG|METAGGA}} exchange-correlation functionals.}}
+<!--
+*The options in the last table allow to select range-separated ACFDT calculations, where a short-range local (DFT-like) exchange and correlation kernel is added to the long-range exchange and RPA correlation energy.
+-->
+==  Available functionals  ==
-Possible options are:
+This table lists the LDA and GGA functionals available in VASP. The names of functionals which end with "_X" and "_C" correspond to exchange-only and correlation functionals, respectively.
-:{| border="1" cellspacing="0" cellpadding="5"
+{| class="sortable wikitable"
-<!-- these first three options have been obsolete since VASP.4.X
-|PB  || Perdew - Becke
 |-
-|PW  || Perdew - Wang 86
+! style="text-align:center;" style=width:6em | GGA= !! style="text-align:center;" style=width:3.5em | Type !! class="unsortable" | Description
 |-
-|LM  || Langreth-Mehl-Hu
+| style="text-align:center;"| LIBXC (or LI) || style="text-align:center;"| LDA/GGA || Any LDA or GGA from the external library Libxc.{{cite|marques:cpc:2012}}{{cite|lehtola:sx:2018}}{{cite|libxc}} It is necessary to have [[Makefile.include#Libxc_.28optional.29|Libxc >= 5.2.0 installed]] and VASP.6.3.0 or higher compiled with [[Precompiler_options#-DUSELIBXC|precompiler options]]. The {{TAG|LIBXC1}} and {{TAG|LIBXC2}} tags (where examples are shown) are also required.
-|- -->
-|{{TAG|GGA}}  || Description
 |-
-|91  || Perdew - Wang 91<ref name="perdew1992"/>
+| style="text-align:center;"| CA (or PZ)<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| LDA || Slater exchange{{cite|dirac:mpcps:1930}} + Perdew-Zunger parametrization of Ceperley-Alder Monte Carlo correlation data.{{cite|ceperley1980}}{{cite|perdewzunger1981}}
 |-
-|PE  || Perdew-Burke-Ernzerhof<ref name="perdew1996"/>
+| style="text-align:center;"| PW92<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| LDA || Slater exchange{{cite|dirac:mpcps:1930}} + Perdew-Wang parametrization of Ceperley-Alder Monte Carlo correlation data.{{cite|ceperley1980}}{{cite|perdew1992}}
 |-
-|AM  || AM05<ref name="armiento:prb:05"/><ref name="mattson:jcp:08"/><ref name="mattson:prb:09"/>
+| style="text-align:center;"| SL<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| LDA || Slater exchange only.{{cite|dirac:mpcps:1930}} Available since VASP.6.4.3.
 |-
-|HL  || Hendin-Lundqvist<ref name="hedin1971"/>
+| style="text-align:center;"| CA_C (or PZ_C) || style="text-align:center;"| LDA || Correlation-only Perdew-Zunger parametrization of Ceperley-Alder Monte Carlo correlation data.{{cite|ceperley1980}}{{cite|perdewzunger1981}} Available since VASP.6.4.3.
 |-
-|CA  || Ceperley-Alder<ref name="ceperley1980"/>
+| style="text-align:center;"| PW92_C || style="text-align:center;"| LDA || Correlation-only Perdew-Wang parametrization of Ceperley-Alder Monte Carlo correlation data.{{cite|ceperley1980}}{{cite|perdew1992}} Available since VASP.6.5.0.
 |-
-|PZ  || Ceperley-Alder, parametrization of Perdew-Zunger<ref name="perdewzunger1981"/>
+| style="text-align:center;"| VW<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| LDA || Slater exchange{{cite|dirac:mpcps:1930}} + Vosko-Wilk-Nusair correlation (VWN5).{{cite|vosko1980}}
 |-
-|WI  || Wigner<ref name="wigner1937"/>
+| style="text-align:center;"| HL<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| LDA || Slater exchange{{cite|dirac:mpcps:1930}} + Hedin-Lundqvist correlation.{{cite|hedin1971}}
 |-
-|RP  || revised Perdew-Burke-Ernzerhof (RPBE)<ref name="hammer1999"/> with Pade Approximation
+| style="text-align:center;"| WI<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| LDA || Slater exchange{{cite|dirac:mpcps:1930}} + Wigner correlation{{cite|Wigner:tfs:1938}} (Eq. (3.2) in Ref. {{cite|pines:ssp:1955}}).
 |-
-|RE  || revPBE<ref name="zhang1998"/>
+| style="text-align:center;"| PE || style="text-align:center;"| GGA || Perdew-Burke-Ernzerhof (PBE).{{cite|perdew:prl:1996}}
 |-
-|VW  || Vosko-Wilk-Nusair<ref name="vokso1980"/> (VWN)
+| style="text-align:center;"| PBE_X || style="text-align:center;"| GGA || Exchange-only Perdew-Burke-Ernzerhof.{{cite|perdew:prl:1996}} Available since VASP.6.4.3.
 |-
-|B3  || B3LYP<ref name="b3lyp"/>, where LDA part is with VWN3-correlation
+| style="text-align:center;"| PBE_C || style="text-align:center;"| GGA || Correlation-only Perdew-Burke-Ernzerhof.{{cite|perdew:prl:1996}} Available since VASP.6.4.3.
 |-
-|B5  || B3LYP, where LDA part is with VWN5-correlation
+| style="text-align:center;"| RE || style="text-align:center;"| GGA || Revised PBE from Zhang and Yang (revPBE).{{cite|zhang1998}}
 |-
-|BF  || BEEF<ref name="beef2012"/>, xc (with libbeef)
+| style="text-align:center;"| RP || style="text-align:center;"| GGA || Revised PBE from Hammer ''et al''. (RPBE).{{cite|hammer1999}}
 |-
-|CO  || no exchange-correlation
+| style="text-align:center;"| PS || style="text-align:center;"| GGA || Revised PBE for solids (PBEsol).{{cite|perdew:prl:2008}}
 |-
-|PS  || Perdew-Burke-Ernzerhof revised for solids (PBEsol)<ref name="perdew:prl:08"/>
+| style="text-align:center;"| AM || style="text-align:center;"| GGA || Armiento-Mattsson (AM05).{{cite|armiento:prb:05}}{{cite|mattson:jcp:08}}{{cite|mattson:prb:09}}
 |-
-|intended for vdW functionals: ||
+| style="text-align:center;"| 91<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| GGA || Perdew-Wang (PW91).{{cite|perdew:prb:1991}}
 |-
-|OR  || optPBE<ref name="klimes2010"/>
+| style="text-align:center;"| B3<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| GGA || B3LYP{{cite|stephens:jpc:1994}} with VWN3{{cite|vosko1980}} for LDA correlation.
 |-
-|BO  || optB88<ref name="klimes2010"/>
+| style="text-align:center;"| B5<span style="color:blue"><sup>(1)</sup></span> || style="text-align:center;"| GGA || B3LYP{{cite|stephens:jpc:1994}} with VWN5{{cite|vosko1980}} for LDA correlation.
 |-
-|MK  || optB86b<ref name="klimes2010"/>
+| style="text-align:center;"| OR<span style="color:blue"><sup>(2)</sup></span> || style="text-align:center;"| GGA || optPBE exchange{{cite|klimes:jpcm:2010}} + PBE correlation.{{cite|perdew:prl:1996}}
 |-
-|special settings for range-separated ACFDT: ||
+| style="text-align:center;"| BO<span style="color:blue"><sup>(2)</sup></span> || style="text-align:center;"| GGA || optB88 exchange{{cite|klimes:jpcm:2010}} + PBE correlation.{{cite|perdew:prl:1996}} {{TAGBL|PARAM1}}=0.1833333333 for <math>\beta</math> and {{TAGBL|PARAM2}}=0.22 for <math>\mu</math> also need to be specified.
 |-
-|RA  || new RPA Perdew Wang
+| style="text-align:center;"| MK<span style="color:blue"><sup>(2)</sup></span> || style="text-align:center;"| GGA || optB86b exchange{{cite|klimes:prb:2011}} + PBE correlation.{{cite|perdew:prl:1996}} The {{TAGBL|PARAM1}} and {{TAGBL|PARAM2}} tags can be used to modify the parameters <math>\mu</math> and <math>\kappa</math>, respectively.
 |-
-|03  || range-separated ACFDT (LDA - sr RPA) <math>\mu=0.3 \AA^3</math>
+| style="text-align:center;"| ML<span style="color:blue"><sup>(2)</sup></span> || style="text-align:center;"| GGA || PW86R exchange{{cite|lee:prb:2010}} + PBE correlation.{{cite|perdew:prl:1996}}
 |-
-|05  || range-separated ACFDT (LDA - sr RPA) <math>\mu=0.5 \AA^3</math>
+| style="text-align:center;"| CX<span style="color:blue"><sup>(2)</sup></span> || style="text-align:center;"| GGA || CX (LV-PW86r) exchange{{cite|berland:prb:2014}} + PBE correlation.{{cite|perdew:prl:1996}}
 |-
-|10  || range-separated ACFDT (LDA - sr RPA) <math>\mu=1.0 \AA^3</math>
+| style="text-align:center;"| BF || style="text-align:center;"| GGA || BEEF (requires VASP compiled with [[Precompiler_options#-Dlibbeef|-Dlibbeef]]).{{cite|beef2012}}
-|-
-|20  || range-separated ACFDT (LDA - sr RPA) <math>\mu=2.0 \AA^3</math>
-|-
-|PL  || new RPA+ Perdew Wang
-|-
-|LIBXC  || any LDA or GGA from Libxc{{cite|marques:cpc:2012}}{{cite|lehtola:sx:2018}}{{cite|libxc}}
 |}
-The tag LIBXC allows to use a LDA or GGA functional from the library of exchange-correlation functionals Libxc{{cite|marques:cpc:2012}}{{cite|lehtola:sx:2018}}{{cite|libxc}}. Along with {{TAG|GGA}}, it is also necessary to specify the tag {{TAG|LIBXC1}} and {{TAG|LIBXC2}} that specify the particular functionals. Note that it is necessary to have Libxc installed and VASP.6.3.0 or higher compiled with ([[Precompiler flags#Optional|-DUSELIBXC]]).
+<span style="color:blue">(1)</span> The Slater LDA exchange includes relativistic effects.{{cite|macdonald:jpc:1979}}
-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.
+<span style="color:blue">(2)</span> The exchange component was designed in particular to be used as the exchange component of {{TAG|Nonlocal vdW-DF functionals}} and with {{TAG|AGGAC}}=0 such that only LDA is used for the local correlation, see [[Nonlocal_vdW-DF_functionals#List_of_nonlocal_vdW-DF_functionals|list of nonlocal vdW-DF functionals]].
-The special flags for range separated RPA have not been extensively tested and should be used only
+== Related tags and articles ==
-after careful inspection of the source code. The flags allow to select range separated ACFDT calculations, where
+{{TAG|LIBXC1}},
-a short range local (DFT-like) exchange and correlation kernel is added to the long range exchange and RPA correlation energy.
+{{TAG|LIBXC2}},
+{{TAG|ALDAX}},
+{{TAG|ALDAC}},
+{{TAG|AGGAX}},
+{{TAG|AGGAC}},
+{{TAG|METAGGA}},
+{{TAG|XC}}
 {{sc|GGA|Examples|Examples that use this tag}}
 == References ==
-<references>
+<references/>
-<ref name="armiento:prb:05">[http://link.aps.org/doi/10.1103/PhysRevB.72.085108 R. Armiento and A. E. Mattsson, Phys. Rev. B 72, 085108 (2005).]</ref>
-<ref name="mattson:jcp:08">[http://dx.doi.org/10.1063/1.2835596 A. E. Mattsson, R. Armiento, J. Paier, G. Kresse, J.M. Wills, and T.R. Mattsson, J. Chem. Phys. 128, 084714 (2008).]</ref>
-<ref name="mattson:prb:09">[http://link.aps.org/doi/10.1103/PhysRevB.79.155101 A. E. Mattsson and R. Armiento, Phys. Rev. B 79, 155101 (2009).]</ref>
-<ref name="perdew:prl:08">[http://link.aps.org/doi/10.1103/PhysRevB.79.155107 J. P. Perdew, A. Ruzsinszky, G. I. Csonka, O. A. Vydrov, G. E. Scuseria, L. A. Constantin, X. Zhou, and K. Burke, Phys. Rev. Lett. 100, 136406 (2008).]</ref>
-<ref name="hedin1971">[http://iopscience.iop.org/article/10.1088/0022-3719/4/14/022/meta;jsessionid=6F1B9F8BE588208D706AAD78E6F0E49A.c2.iopscience.cld.iop.org L. Hedin and B. I. Lundqvist, J. Phys. C 4, 2064 (1971).]</ref>
-<ref name="ceperley1980">[http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.45.566 D. M. Ceperley and B. J. Alder, Phys. Rev. Lett. 45, 566 (1980).]</ref>
-<ref name="perdewzunger1981">[http://journals.aps.org/prb/abstract/10.1103/PhysRevB.23.5048 J. P. Perdew and Alex Zunger, Phys. Rev. B 23, 5048 (1981).]</ref>
-<ref name="wigner1937">[http://aip.scitation.org/doi/10.1063/1.1750108 E. Wigner, J. Chem. Phys. 5, 726 (1937).]</ref>
-<ref name="hammer1999">[http://journals.aps.org/prb/abstract/10.1103/PhysRevB.59.7413 B. Hammer, L. B. Hansen and J. K. Nørskov, Phys. Rev. B 59, 7413 (1999).]</ref>
-<ref name="vokso1980">[http://www.nrcresearchpress.com/doi/abs/10.1139/p80-159#.WJLvYmf950w S. H. Vosko, L. Wilk and M. Nusair, Can. J. Phys. 58, 1200 (1980).]</ref>
-<ref name="b3lyp">[http://aip.scitation.org/doi/10.1063/1.464913 A. D. Becke, J. Chem. Phys. 98, 5648 (1993).]</ref>
-<ref name="beef2012">[http://journals.aps.org/prb/abstract/10.1103/PhysRevB.85.235149 Jess Wellendorff, Keld T. Lundgaard, Andreas Møgelhøj, Vivien Petzold, David D. Landis, Jens K. Nørskov, Thomas Bligaard and Karsten W. Jacobsen, Phys. Rev. B 85, 235149 (2012).]</ref>
-<ref name="zhang1998">[http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.80.890 Y. Zhang and W. Yang, Phys. Rev. Lett. 80, 890 (1998).]</ref>
-<ref name="klimes2010">[http://iopscience.iop.org/article/10.1088/0953-8984/22/2/022201/meta J. Klimeš, D. R. Bowler, and A. Michaelides, J. Phys.: Cond. Matt. 22, 022201 (2010).]</ref>
-<ref name="perdew1992">[http://journals.aps.org/prb/abstract/10.1103/PhysRevB.45.13244 J. P. Perdew and Y. Wang, Phys. Rev. B 45, 13244 (1992).]</ref>
-<ref name="perdew1996">[http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.77.3865 J. P. Perdew, K. Burke, and M. Ernzerhof, Phys. Rev. Lett. 77, 3865 (1996).]</ref>
-</references>
 ----
-[[The_VASP_Manual|Contents]]
-[[Category:INCAR]][[Category:XC Functionals]][[Category:GGA]]
+[[Category:INCAR tag]][[Category:Exchange-correlation functionals]][[Category:GGA]]