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[交流] 计算normalized trace of interatomic force constant tensors的小程序

介绍
a post-processing code can calculate normalized trace of interatomic force constant tensors versus atomic distances from force_constants produced by phonopy. refer: nat. commun., 2014, 5, 3525.
计算normalized trace of interatomic force constant tensors的小程序

具体公式
the interatomic force constant (ifc) tensor from first-principles calculation is
计算normalized trace of interatomic force constant tensors的小程序-1
where e and rα represent energy and atomic position along α direction, respectively. by taking
trace of ifc tensors, we can assess bonding stiffness regardless of crystal structure or coordinate
system.
计算normalized trace of interatomic force constant tensors的小程序-2
finally, we need to normalize the trace values of many materials to compare their interaction
ranges as in fig. 3, since different materials have slightly different bonding stiffness. the
normalization is done by the trace value of self-interaction force_constants.
计算normalized trace of interatomic force constant tensors的小程序-3

###########
useage:
###########
1. chmod +x trace_ifc.x
2. phonon calculations with phonopy.
3. ./trace_ifc.x (it reads force_constants and sposcar produced by phonopy)
4. plot trace_ifc.dat with gunplot, python, or freemat and so on.
5. trace_ifc.dat 格式说明
计算normalized trace of interatomic force constant tensors的小程序-4
计算normalized trace of interatomic force constant tensors的小程序-5

[ Last edited by 漫天飘雪 on 2020-9-5 at 10:39 ]
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不太会分析,图都做不出来,有高手指导一下吗
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