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The antiferromagnetic solution

A study of the 3D Hubbard model in the antiferromagnetic phase by means of the COM is reported in Ref. [61]. In particular the following properties have been computed:

  1. The thermodynamic properties (i.e., order parameter: staggered magnetization, phase diagram) [61]

  2. The single-particle properties (i.e., density of states) [61]

We found very similar results to those obtained for the 2D case (see Sec. [*]). The higher coordination number of the 3D model reduces the fluctuations and leads to a greater stability of the antiferromagnetic phase as a function of the temperature $ T$, the filling $ n$ and the on-site Coulomb repulsion $ U$. In particular, the metallic antiferromagnetic phase extends to much lower values of the filling $ n$. For values of the repulsion $ U$ up to $ 30t$, this additional antiferromagnetic region is separated by the antiferromagnetic phase near half-filling by a paramagnetic region. For higher values of the interaction $ U$ this two regions join and reveal that they are two parts of a single antiferromagnetic solution.


next up previous
Next: Ladders and Layers Up: The 3D Hubbard model Previous: The 3D Hubbard model
avella 2002-06-10