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sissiya

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[求助] 烧绿石色散曲线虚频,求大神指导

用的是DPFT+phonopy
POSCAR
227                                    
   10.5180000000000     
     0.9910330477770712    0.0000046877081529    0.0000045908099017
     0.0000046249782642    0.9910330529463794    0.0000042931272587
     0.0000046298586953    0.0000048728411833    0.9910331946742411
   La   Ti   O
  16  16  56
Direct
  0.5000000003194939  0.4999999998800764  0.5000000004083356
  0.5000000023857027  0.0000000024087114  0.0000000031903061
  0.0000000047624783  0.5000000040297651  0.0000000045017491
  0.0000000028647936  0.0000000019781089  0.5000000027129361
  0.2499999958838694  0.7499999968112842  0.0000000036047602
  0.2499999973521935  0.2499999970237524  0.5000000026428832
  0.7499999986695064  0.0000000022709028  0.2499999977471398
  0.7499999980405750  0.5000000012970177  0.7499999977583173
  0.0000000043749874  0.2499999948938977  0.7499999964230435
  0.5000000022676699  0.2499999977977463  0.2499999980401584
  0.2499999965953229  0.5000000025925094  0.2499999972271685
  0.7499999969025389  0.2499999958243983  0.0000000040938962
  0.7500000000301911  0.7499999995486341  0.5000000002398162
  0.2499999960788628  0.0000000027129739  0.7499999973299938
  0.0000000029482144  0.7499999973592067  0.2499999969734431
  0.5000000006978618  0.7499999989721848  0.7499999991898731
  0.0000000003597923 -0.0000000001402068 -0.0000000000926390
-0.0000000007843032  0.5000000005226520  0.4999999997015037
  0.5000000008963545 -0.0000000011544423  0.4999999987382152
  0.4999999993466975  0.5000000019256028 -0.0000000028970010
  0.7499999992208467  0.2500000017873795  0.5000000002175427
  0.7499999981093881  0.7500000012711961 -0.0000000015404304
  0.2500000019829406  0.5000000014805064  0.7499999996402261
  0.2500000003752919  0.0000000008503994  0.2499999982863747
  0.7499999975815294 -0.0000000024428949  0.7500000003226400
  0.5000000001255872  0.7500000009690947  0.2500000000311622
-0.0000000018365885  0.7500000011349154  0.7499999988202496
  0.2500000010175379  0.7499999998543105  0.5000000015198933
  0.2500000000058862  0.2500000004934287  0.0000000008385043
  0.7500000010165165  0.5000000002797056  0.2500000036595788
  0.5000000001602566  0.2500000025428020  0.7499999992358932
  0.0000000016070129  0.2500000010388173  0.2499999995752705
  0.3224929166606545  0.1249966581574418  0.1249966380460253
  0.3224929163001186  0.6249966570024477  0.6249966384087559
  0.8224929160510512  0.1249966574279002  0.6249966384201431
  0.8224929156301038  0.6249966579833662  0.1249966372144766
  0.4275000988068887  0.1250001889552602  0.6250001915164678
  0.9275000983313807  0.6250001880904881  0.6250001914622858
  0.9275000977230136  0.1250001887679441  0.1250001911626789
  0.1249966530041636  0.3224929164189868  0.1249966449375185
  0.1249966523662375  0.8224929155753226  0.6249966450084234
  0.6249966530807446  0.8224929151180553  0.1249966446895044
  0.6250001838271915  0.4275000997226174  0.1250001840348874
  0.6250001845675176  0.9275000997194316  0.6250001850791884
  0.6249966528158365  0.3224929158746176  0.6249966451655408
  0.1249966405065596  0.1249966520604538  0.3224929158068559
  0.1249966401600436  0.6249966513295222  0.8224929143332488
  0.6249966404639749  0.1249966521358555  0.8224929148313265
  0.1250001939758320  0.6250001915984678  0.4275000948638110
  0.1250001937459266  0.1250001921684011  0.9275000944159543
  0.6250001943580384  0.6250001918572662  0.9275000947963524
  0.6249966399931819  0.6249966522774857  0.3224929150469067
  0.8749998158639969  0.5724999003907133  0.3749998154964967
  0.8749998151447532  0.0724999010409085  0.8749998149042457
  0.8750033468448990  0.6775070826519723  0.8750033551661489
  0.3750033476181749  0.1775070837221882  0.8750033543672745
  0.3750033476239754  0.6775070837075661  0.3750033548189468
  0.3749998166403543  0.0724999003899640  0.3749998161408244
  0.0724999016291056  0.3749998117698067  0.3749998094381935
  0.0724999024030379  0.8749998107536413  0.8749998081395404
  0.1775070838659257  0.8750033418930402  0.3750033624253631
  0.6775070836596806  0.8750033421634945  0.8750033616317805
  0.6775070836753568  0.3750033422809384  0.3750033618592775
  0.5724999022216433  0.3749998112253486  0.8749998086613620
  0.8750033591819709  0.3750033484681948  0.1775070842160550
  0.3749998066736287  0.3749998083395445  0.0724999052834888
  0.8749998052698460  0.8749998072456803  0.0724999056621460
  0.3749998060490847  0.8749998078324217  0.5724999059854490
  0.8750033594037860  0.8750033475009477  0.6775070849468350
  0.5724999015111555  0.8749998112804980  0.3749998089795636
  0.1775070832798415  0.3750033428272920  0.8750033616910842
  0.3749998157530237  0.5724999001760455  0.8749998150967411
  0.8750033468746264  0.1775070838959627  0.3750033559465820
  0.8749998056730334  0.3749998076713931  0.5724999059080280
  0.3750033603032042  0.8750033475292756  0.1775070852598133
  0.3750033598457020  0.3750033476513774  0.6775070855580083
  0.1250001842485011  0.4275000992276968  0.6250001850158476
  0.1250001838887003  0.9275000990974831  0.1250001845373218
  0.4275000985963830  0.6250001883764379  0.1250001913432826
  0.6250001945446542  0.1250001925312793  0.4275000944030698
  0.3750011321891616  0.3750011324835222  0.3750010975435710
  0.3750011320333188  0.8750011313366072  0.8750010964240197
  0.8750011300676123  0.8750011310184108  0.3750010973722656
  0.8750011308596790  0.3750011322806628  0.8750010967167883
  0.1249988674624060  0.6249988673980712  0.1249989015640376
  0.6249988694080540  0.6249988677082396  0.6249989038396863
  0.6249988695185232  0.1249988691646539  0.1249989016895942
  0.1249988684457326  0.1249988689129503  0.6249989045861107

KPOINTS
A
0
M
2 2 2
0 0 0

INCAR(优化)
SYSTEM = La2Ti2O7
ISTART = 0
ICHARG = 2
ISMEAR = 0
SIGMA = 0.05
ISYM=0
ENCUT=400
PREC=Accurate
EDIFF=1E-8
EDIFFG=-1E-6
IBRION=2
POTIM=0.02
GGA=91
VOKOWN=1
ISIF=3
NSW=2000
LAECHG=.TRUE.
LREAL= Auto

INCAR(DFPT)
SYSTEM = La2Ti2O7
PREC=Accurate
ENCUT=400
IBRION=8
NELMDL=-5
NSW=1
POTIM=0.2
EDIFF=1E-8
IALGO=38
ISMEAR=0; SIGMA=0.2
#LREAL=Auto
LREAL=.FALSE.
ADDGRID=.TRUE.
LWAVE=.FALSE.
LCHARG=.FALSE.

烧绿石色散曲线虚频,求大神指导
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