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stevencong新蟲 (初入文壇)
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[求助]
~~有關(guān)磁性體系計(jì)算能帶時(shí)遇到的問題~~
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把全部金幣貼進(jìn)來了,求大牛們指導(dǎo)啊~~ 現(xiàn)在在做磁性納米管的能帶計(jì)算,但是不太清楚計(jì)算方法。我的計(jì)算過程是這樣的: 1. 計(jì)算體系的Charge Density,輸入文件如下(其中MAGMOM是從弛豫后的OUTCAR文件中抄下來的): SYSTEM = Nanotube ENCUT = 800 ISTART = 0; ICHARG = 2 ISMEAR = -5 ISPIN = 2 MAGMOM = 0.03 0.03 -0.01 0.007 0.03 0.03 0.038 0.038 0.006 -0.01 0.039 0.038 0.03 0.03 -0.01 0.006 0.03 0.03 0.039 0.039 0.007 -0.01 0.038 0.038 0.03 0.03 -0.01 0.006 0.03 0.03 0.038 0.038 0.006 -0.01 0.038 0.039 PREC = Accurate 2. 再做BS計(jì)算,輸入文件為: SYSTEM = Nanotube ENCUT = 800 ISTART = 1; ICHARG = 11 NBANDS = 120 ISPIN = 2 MAGMOM = 0.03 0.03 -0.01 0.007 0.03 0.03 0.038 0.038 0.006 -0.01 0.039 0.038 0.03 0.03 -0.01 0.006 0.03 0.03 0.039 0.039 0.007 -0.01 0.038 0.038 0.03 0.03 -0.01 0.006 0.03 0.03 0.038 0.038 0.006 -0.01 0.038 0.039 PREC = Accurate 但是每次在計(jì)算BS時(shí)VASP剛開始運(yùn)行就掛掉了,out文件輸出: running on 16 nodes distr: one band on 1 nodes, 16 groups vasp.5.2.2 15Apr09 complex POSCAR found type information on POSCAR C POSCAR found : 1 types and 36 ions ----------------------------------------------------------------------------- | | | ADVICE TO THIS USER RUNNING 'VASP/VAMP' (HEAR YOUR MASTER'S VOICE ...): | | | | You have a (more or less) 'large supercell' and for larger cells | | it might be more efficient to use real space projection operators | | So try LREAL= Auto in the INCAR file. | | Mind: If you want to do a very accurate calculations keep the | | reciprocal projection scheme (i.e. LREAL=.FALSE.) | | | ----------------------------------------------------------------------------- LDA part: xc-table for Pade appr. of Perdew WARNING: stress and forces are not correct POSCAR, INCAR and KPOINTS ok, starting setup FFT: planning ...( 1 ) 然后,然后就什么都沒有了。。。不知道哪位能解決這個問題???在此先謝過了~ |
金蟲 (小有名氣)
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這不是掛掉,這是條件太苛刻以致于一步都跑不出來…… ENCUT=800...手冊上第一個例子就是講的測試ENCUT吧...無論如何800太高了。 NBANDS并不需要手動提高,如果不關(guān)心高能空帶的結(jié)構(gòu)、也不需要計(jì)算光學(xué)性質(zhì)的話。 另外KPOINTS不能過多。樓主是不是沿著高對稱路徑“老板,每條路徑給我來50個K點(diǎn)”?先用較低的標(biāo)準(zhǔn)測試成功了,再在可接受的世界范圍內(nèi)提高精度。 LREAL=AUTO可以考慮寫上。 |
新蟲 (初入文壇)
新蟲 (初入文壇)
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結(jié)果又變成這樣了: running on 8 nodes distr: one band on 1 nodes, 8 groups vasp.5.2.2 15Apr09 complex POSCAR found type information on POSCAR C POSCAR found : 1 types and 36 ions LDA part: xc-table for Pade appr. of Perdew WARNING: stress and forces are not correct POSCAR, INCAR and KPOINTS ok, starting setup WARNING: small aliasing (wrap around) errors must be expected FFT: planning ...( 1 ) reading WAVECAR WARNING: dimensions on CHGCAR file are different ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 ERROR: charge density could not be read from file CHGCAR for ICHARG>10 我兩次計(jì)算所用的POSCAR應(yīng)該一樣啊,為什么Dimension會不一樣呢? |
鐵桿木蟲 (著名寫手)
新蟲 (初入文壇)
鐵桿木蟲 (著名寫手)
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計(jì)算能帶用ICHARG=11沒有問題 能帶的計(jì)算就是在自洽計(jì)算之后的到的電荷密度分布即為CHGCAR的前提下,進(jìn)行費(fèi)自洽計(jì)算的得到的 也就是說自洽計(jì)算得到CHGCAR,用做下一步計(jì)算 你是不是只是ICHGCAR=11,但是沒有給CHGCAR,或是在計(jì)算上改變了什么參數(shù),使得計(jì)算Bands時(shí)候,無法正確讀取電荷分布,所以程序會報(bào)錯“ERROR: charge density could not be read from file CHGCAR for ICHARG>10”,也就是說參數(shù)設(shè)置大于10,要求讀取CHGCAR但是沒有讀到相應(yīng)數(shù)據(jù) |
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