1.单独使用eam势函数 pair style 和pair coeff 的写法：
pair_style eam
pair_coeff * * Cu.eam #cu-cu
2.混合势函数的写法：
pair_style hybrid lj/cut/coul/long 10.0 lj/cut 10.0 eam
pair_coeff 2 2 lj/cut/coul/long 0.006998 3.16435
pair_coeff 2 3 lj/cut/coul/long 0.0000000000 0.0000
pair_coeff 3 3 lj/cut/coul/long 0.0000000000 0.0000
pair_coeff 1 2 lj/cut 0.06387 2.8675
pair_coeff 1 3 lj/cut 0 0
pair_coeff 2 4 lj/cut 0.01 2.8675
pair_coeff 3 4 lj/cut 0 0
pair_coeff 1 1 eam Cu.eam
pair_coeff 4 4 eam Cu.eam
注意区分！！！！