The coexistent of superconductivity (SC) with antiferromagnetism (AFM) and ferromagnetism (FM) as U ?? is studied in CeCu 2 Si 2 on application of the Exact Diagonalization technique to the Single site Impurity Anderson Model and the Periodic Anderson Model. The results obtained show that magnetic instability is the key to understanding superconductivity in Heavy Fermion compounds as increasing the onsite coulomb repulsion, U, suppresses all ferromagnetic tendencies and enhances superconductivity. The results obtained here is in qualitative agreement with the inelastic neutron scattering experimental results obtained by Stockert et al (2011) on increasing the copper content in CeCu 2 Si 2 . U in this theoretical study behaves as Cu in the inelastic neutron scattering experiment.
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机译：超导（SC）与反铁磁性（AFM）和铁磁性（FM）并存为U？在精确对角化技术应用于单点杂质安德森模型和周期安德森模型中，在CeCu 2 Si 2中进行了研究。所得结果表明，磁不稳定性是理解重费米子化合物中超导性的关键，因为增加现场库仑排斥力U会抑制所有铁磁趋势并增强超导性。此处获得的结果与Stockert等人（2011）在增加CeCu 2 Si 2中铜含量方面获得的非弹性中子散射实验结果在质量上吻合。在该理论研究中，U在非弹性中子散射实验中的行为与Cu相同。
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