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gengw07鐵蟲 (小有名氣)
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[求助]
有關LDA+U U值的問題
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| castep計算中使用LDA+U或者GGA+U,文獻中看到Ueff=U-J,castep中的U是哪個呢?是U還是Ueff,而且也沒有設置J的地方,幫助文件中似乎也沒有提到。希望高手給予解釋,謝謝。文獻使用VASP,好像是U、J分開設置的。 |
first principle |
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VASP手冊上來的,樓主研究一下 U,J分開設,但是具體的材料應該有經(jīng)驗值。 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). |
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