Thank you Dr Gavin and Dr Gerhard for your answers. The were really very fruitful for me.
We can consider that the non spin-polarized is a special case of the spin-polarized case. therefore we can use the equations of the general case to get the equations of the special case. So we can make B_eff = 0 to get the non-polarized case, and the results will be different as the energies. another question: How can explain that at the level of the paired and unpaired electrons? Will we force the unpaired electrons to be paired one or something other ? Thank you for your interesting -- Mr: A.Reggad Laboratoire de Génie Physique Université Ibn Khaldoun - Tiaret Algerie
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