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matxiong

木虫 (正式写手)

[交流] [求助]反铁磁计算问题请教!

我做一个铁磁计算

INCAR:
FM设置
ISPIN=2
MAGMOM=16*1 30*1 1*1 1*1

AFM设置
ISPIN=2
MAGMOM=16*1 30*1 1*1 1*-1

其中磁性原子被标记了正负号,其他原子没有标记正负号

可是AFM设置算出来的磁矩和FM设置相同

请问哪里有错误?

我的可能没有磁性超晶胞设置,因为两个铁磁原子位置没有对称性相连。有人做过类似计算没有?

[ Last edited by wuli8 on 2009-6-21 at 22:30 ]
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sunray55

银虫 (小有名气)

★ ★
灯塔守望者(金币+2,VIP+0):谢谢支持小木虫
首先建议不考虑spin interaction的原子都设置为0
FM:   62*0 1 1
AFM: 62*0 1 -1
其次,算完后要比较fm&AFM 的总能,来判断基态是单重态还是三重态。
最后,也是最关键的就是你考虑磁耦合的两个原子的距离要恰当,如果空间波函数扩展不大,或者没有媒介耦合,都无法得到正确的结果。
9楼2008-09-23 11:54:12
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mermaid1128

木虫 (著名写手)

把POSCAR贴出来看看

把POSCAR贴出来看看
2楼2008-09-23 10:29:31
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matxiong

木虫 (正式写手)

10.7762194459285900    0.0000000000000000    0.0000000000000000
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  32  30   2
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  0.3705845954778504  0.3705845954778504  0.1233039916326623
  0.3705857583589943  0.3705857583589943  0.6233024059111214
3楼2008-09-23 10:56:49
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matxiong

木虫 (正式写手)

呵呵,搞错了,上面的POSCAR和INCAR不对应,但都是后面2个原子考虑磁性相反
4楼2008-09-23 11:00:38
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