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[求助]
固定C軸 鬆弛A B軸 的方法
????PAW???????BiFeO3 ????relax??(ISIF=3)
?l?F?w?e(115.5)?????(126)????s9%
?????vasp?????23???}?s??r
???f???{????????????????????λ??
????????????C?S ????A B?S ????w?e??????
???????POSCAR??
Fe2 Bi2 O6
1.00000000000000
4.7056534361214437 -0.0473600491087546 2.7444919032575892 (a?S)
1.5539706021362183 4.4419135148306212 2.7444919082264456 (b?S)
-0.0674598255581248 -0.0473599951737402 5.4470968385121745
a??b?S ??e????0.98~1.05????s?w?e
INCAR????
SYSTEM=BiFeO3_R3C (Fe Bi O)
ISTART = 0 ; ICHARG = 2
ISPIN = 2 # spinpolarized calculations
ENCUT = 450
PREC = Accurate
ISMEAR = -5 ; SIGMA = 0.2
#EDIFF = 1E-5
#EDIFFG = -1E-3
NPAR = 1
MAGMOM = 6 -6 0 0 0 0 0 0 0 0
NSW = 60
IBRION = 2
ISIF = 2
LDAU = .TRUE. #Switches on the L(S)DA+U
LDAUTYPE = 2 #Dudarev??s approach to LSDA+U
LDAUL = 2 -1 -1
LDAUU = 0 0 0
LDAUJ = 0 0 0
#RWIGS = 1.164 1.635 0.82
???????????????s????????relax????????
?????????
????????????????????e???
???x
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