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本帖最后由 longyp 于 2024-12-7 19:25 编辑
使用VASP优化Ni单质,定义了磁矩和+U,但是SCF始终不收敛,请问应该怎么调节参数呢?ALGO试过Fast,Very_Fast和Normal都不行
以下为使用的INCAR文件内容:Global Parameters
ISTART = 1 (Read existing wavefunction, if there)
ISPIN = 2 (Non-Spin polarised DFT)
NCORE = 15
# ICHARG = 11 (Non-self-consistent: GGA/LDA band structures)
LREAL = .FALSE. (Projection operators: automatic)
ENCUT = 450 (Cut-off energy for plane wave basis set, in eV)
PREC = Accurate (Precision level: Normal or Accurate, set Accurate when perform structure lattice relaxation calculation)
LWAVE = .TRUE. (Write WAVECAR or not)
ALGO = Normal
LCHARG = .TRUE. (Write CHGCAR or not)
ADDGRID= .TRUE. (Increase grid, helps GGA convergence)
Electronic Relaxation
ISMEAR = 1 (Gaussian smearing, metals:1)
SIGMA = 0.1 (Smearing value in eV, metals:0.2)
NELM = 200 (Max electronic SCF steps)
NELMIN = 6 (Min electronic SCF steps)
EDIFF = 1E-05 (SCF energy convergence, in eV)
GGA = PE (PBEsol exchange-correlation)
Ionic Relaxation
NSW = 300 (Max ionic steps)
IBRION = 2 (Algorithm: 0-MD, 1-Quasi-New, 2-CG)
ISIF = 2 (Stress/relaxation: 2-Ions, 3-Shape/Ions/V, 4-Shape/Ions)
EDIFFG = -3E-02 (Ionic convergence, eV/AA)
ISYM = 0 (Symmetry: 0=none, 2=GGA, 3=hybrids)
IVDW = 12
MAGMOM = 108*0.8
LDAU = .TRUE.
LDAUTYPE = 2
LDAUL = 2
LDAUU = 5.5
LDAUJ = 0
LMAXMIX =4
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