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gengw07

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CASTEPµÄ»°Çë²Î¿¼Acta Mater 59, 1742 (2011)
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ACTA MATERIALIA  ¾í: 59   ÆÚ: 4   Ò³: 1742-1760   DOI: 10.1016/j.actamat.2010.11.041   ³ö°æÄê: FEB 2011
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ACTA MATERIALIA  ¾í: 59   ÆÚ: 4   Ò³: 1742-1760   DOI: 10.1016/j.actamat.2010.11.041   ³ö°æÄê: FEB 2011
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dufeifei

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uuv2010(½ð±Ò+1): »¶Ó­²Î¼Ó½»Á÷ 2011-09-26 10:13:56
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The L(S)DA+U in VASP is switched on by means of the following tags


LDAU = .TRUE. Switches on the L(S)DA+U.
LDAUTYPE = 1|2|4 Type of L(S)DA+U (Default: LDAUTYPE = 2)
1
Rotationally invariant LSDA+U according to Liechtenstein et al.
4
Idem 1., but LDA+U instead of LSDA+U (i.e. no LSDA exchange splitting)
2
Dudarev's approach to LSDA+U (Default)
LDAUL = L .. -quantum number for which the on site interaction is added
(-1: no on site terms added, 1: p, 2: d, 3: f, Default: LDAUL = 2)
LDAUU = U .. Effective on site Coulomb interaction parameter
LDAUJ = J .. Effective on site Exchange interaction parameter
LDAUPRINT = 0|1|2 Controls verbosity of the L(S)DA+U module
(0: silent, 1: Write occupancy matrix to OUTCAR, 2: idem 1., plus potential matrix dumped to stdout, Default: LDAUPRINT = 0)
NB: LDAUL, LDAUU, and LDAUJ must be specified for all atomic species!


It is important to be aware of the fact that when using the L(S)DA+U, in general the total energy will depend on the parameters  and . It is therefore not meaningful to compare the total energies resulting from calculations with different  and/or  [c.q.  in case of Dudarev's approach].

Note on bandstructure calculation: The CHGCAR file also contains only information up to LMAXMIX for the on-site PAW occupancy matrices. When the CHGCAR file is read and kept fixed in the course of the calculations (ICHARG=11), the results will be necessarily not identical to a selfconsistent run. The deviations can be (or actually are) large for L(S)DA+U calculations. For the calculation of band structures within the L(S)DA+U approach, it is hence strictly required to increase LMAXMIX to 4 (d elements) and 6 (f elements).
7Â¥2011-09-25 16:30:30
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