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[求助]
Vasp+phonopy 声子谱出现离奇虚频!
我用vasp+phonopy计算奥氏体的声子谱,出现离奇虚频,以前用fropho也是这样,苦恼了很久,我到底错哪了呢?请大家帮忙看看,非常感谢!
原胞16个原子 2x2x2超胞
INCAR
System = Ni2MnGa 16 atoms
PREC = Accurate #cutoff + wrap around errors.
IBRION = 2 #conj. grad. relaxation.
NSW = 50 #numberof ionic steps taken in minimization. Make it odd.
ISIF = 7 #whether stress tensor is calculated, what is allowed to relax.
ENCUT = 500 #cutoff
EDIFF = 1.0e-08
EDIFFG = -1.0e-06
NELMIN = 5
ISMEAR = 1
SIGMA = 0.1
IALGO = 38
LREAL = .FALSE.
ADDGRID = .TRUE.
LWAVE = .FALSE.
LCHARG = .FALSE.
NPAR = 4
POSCAR
Calculation of Ni2MnGa Fm3m
5.81100000000000
0.9839605694317315 0.0000000000000000 0.0000000000000000
0.0000000000000000 0.9839605694317315 0.0000000000000000
0.0000000000000000 0.0000000000000000 0.9839605694317315
Ni Mn Ga
8 4 4
Direct
0.2500000000000000 0.2500000000000000 0.2500000000000000
0.2500000000000000 0.7500000000000000 0.2500000000000000
0.7500000000000000 0.2500000000000000 0.2500000000000000
0.7500000000000000 0.7500000000000000 0.2500000000000000
0.2500000000000000 0.2500000000000000 0.7500000000000000
0.2500000000000000 0.7500000000000000 0.7500000000000000
0.7500000000000000 0.2500000000000000 0.7500000000000000
0.7500000000000000 0.7500000000000000 0.7500000000000000
0.5000000000000000 0.5000000000000000 0.5000000000000000
0.0000000000000000 0.5000000000000000 0.0000000000000000
0.5000000000000000 0.0000000000000000 0.0000000000000000
0.0000000000000000 0.0000000000000000 0.5000000000000000
0.0000000000000000 0.0000000000000000 0.0000000000000000
0.5000000000000000 0.5000000000000000 0.0000000000000000
0.0000000000000000 0.5000000000000000 0.5000000000000000
0.5000000000000000 0.0000000000000000 0.5000000000000000
KPOINTS
Ni2MnGa
0
Gamma point shift
12 12 12
0 0 0
band.conf
ATOM_NAME = Ni Mn Ga
DIM = 2 2 2
PRIMITIVE_AXIS = 0.0 0.5 0.5 0.5 0.0 0.5 0.5 0.5 0.0
BAND = 0.0 0.0 0.0 0.5 0.5 1.0
FORCE_SETS
128
3
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