超导体的超导电性和反铁磁性共存的研究

Study of Coexistence of Anti-ferromagnetism and Superconductivity of Superconductors

在二维空穴掺杂t-t′-J-U模型和重整化平均场理论的框架下,用Gutzwiller方法研究了Gossamer超导体的超导电性和反铁磁性的共存,探讨了电子次近邻跃迁对共存的影响,发现在掺杂浓度δ≤0.1的欠掺杂区反铁磁序和超导序共存。随着电子次近邻跃迁的增大,反铁磁序得到增强,超导序参数在欠掺杂区域受到抑制,在过掺杂区明显地得到增强,导致反铁磁序和超导序共存区域变大。超导序和反铁磁序共存的状态比纯粹的超导态能量低,共存状态更稳定。

The coexistence of anti-ferromagnetism and superconductivity of superconductors were investigated in a renormalized mean field theory based on the Gutzwiller variational approach in the two dimensions hole-doped t-t′-J-U model.The effects on the coexistence were discussed.The anti-ferromagnetic order coexists with the d-wave superconductivity in the under doped region below the doping δ≤0.1.The anti-ferromagnetism orders are greatly enhanced with the increasing of the next-nearest-neighbor hopping(t′).The superconductivity order are slightly suppressed by t′ in under doped regions and enhanced in over doped,so the coexistence extends to the larger one.The ground state energy of the coexistent state is always lower than that of the pure superconductivity state.