Asymmetrical Magnetic Properties of Electron and Hole Doped High-T_c Superconductors

概要

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Using an extension of the Gutzwiller approximation and applying the Bethe-lattice method, we have determined for the one band Hubbard Hamiltonian the magnetic phase diagram, which includes ferromagnetic, antiferromagnetic, paramagnetic state with local moments, and Pauli paramagnetic phases. To deduce the magnetic properties for electron and hole doped high T_c superconductors, we take into account the characteristics of the electron and hole doping and map the two band Hubbard Hamiltonian into one band Hubbard Hamiltonian. In agreement with experiment we obtain from the same electronic theory with the parameters of two band Hubbard Hamiltonian that antiferromagnetism disappears at a doping concentration δsime 0.04 in the case of hole doping and at δsime 0.15 in the case of electron doping. We find that only for hole doping a spin glass state following the antiferromagnetic phase occurs.
理論物理学刊行会の論文
1992-02-25