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On the ground state phase diagram of the Hubbard model

1982; IOP Publishing; Volume: 15; Issue: 30 Linguagem: Inglês

10.1088/0022-3719/15/30/004

1747-3802

Andrzej M. Oleś,

Advanced Condensed Matter Physics

Magnetic ordering of the Hubbard model is investigated with the help of a variational ansatz for the ground state. It is shown that only antiferromagnetic and special ferromagnetic states are stable against the paramagnetic one for the band fillings n close to n=1 and sufficiently strong Coulomb interaction.