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[求助] 第一性原理分子动力学计算 vasp nvt 温度不断降低

大家好。 vasp分子动力学初学者、
设定温度为900,在40 fs上升到3500K 然后开始下降。在120fs 已经下降到100K。不知道什么原因。谢谢
下面是INCAR
    PREC = Normal
   ENCUT = 172.069
  IBRION = 0
     NSW = 2000
    ISIF = 2
  NELMIN = 4
   EDIFF = 1.0e-04
  EDIFFG = -0.02
VOSKOWN = 1
    ISYM = 0
   SMASS = 2
   POTIM = 5
  NBLOCK = 1
   TEBEG = 900
   TEEND = 900
  NWRITE = 1
    NELM = 60
    ALGO = Very Fast (RMM-DIIS)
MDALGO = 2
   ISPIN = 1
  INIWAV = 1
  ISTART = 0
  ICHARG = 2
   LWAVE = .FALSE.
  LCHARG = .FALSE.
ADDGRID = .FALSE.
  ISMEAR = 1
   SIGMA = 0.2
   LREAL = Auto
LSCALAPACK = .FALSE.
RWIGS = 1.40 1.22 1.36 0.75

# Default options for parallel
    NPAR = 16
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