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hai951753

新虫 (初入文坛)

[求助] vasp 求BE的单原子能量INCAR怎么设置 已有1人参与

vasp给的例子O atom spinpolarized low symmetry
INCAR
SYSTEM = O atom in a box
ISMEAR = 0  ! Gaussian smearing
SIGMA  = 0.01
ISPIN =  2  ! spin polarized calculation

结果是E0= -.79573180E+00


参考侯柱峰教程里给的
SYSTEM = Ni
ENCUT = 500
ISYM = 0 ! no symmetry
ISPIN = 2 ! allow for spin polarisation
!VOSKOWN = 1 ! this is important, in particular for GGA   这个去掉了,vasp中说PW91用1,我用的PBE势
ISMEAR = 0 ! Gaussian smearing, otherwise negative occupancies
SIGMA = 0.01 ! intermid. smearing width           原值0.1
AMIX = 0.2 ! mixing set manually
BMIX = 0.0001
NELM = 20 ! 20 electronic steps
ICHARG = 1
连续提交两次,第一次电子步不收敛,第二次收敛E0= -.65321068E+00、、、、为什么两个能量不一样?哪个可信?
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hai951753

新虫 (初入文坛)

引用回帖:
2楼: Originally posted by wmy8802217 at 2014-09-18 17:04:47
这个是总能量吧。。你要去eigenvalue文件里边看

也不一样的
3楼2014-09-18 17:56:13
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wmy8802217

木虫 (正式写手)

【答案】应助回帖

感谢参与,应助指数 +1
这个是总能量吧。。你要去eigenvalue文件里边看
凝聚态理论与计算物理
2楼2014-09-18 17:04:47
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