Magnetic phase transitions and unusual antiferromagnetic states in the Hubbard modelстатья
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Аннотация:Ground state magnetic phase diagrams of the square and simple cubic lattices are investigated for the
narrow band Hubbard model within the slave-boson approach by Kotliar and Ruckenstein. The transi-
tions between saturated (half-metallic) and non-saturated ferromagnetic phases as well as similar tran-
sition in antiferromagnetic (AFM) state are considered in the three-dimensional case. Two types of
saturated antiferromagnetic state with different concentration dependences of sublattice magnetization
are found in the two-dimensional case in the vicinity of half-filling: the state with a gap between AFM
subbands and AFM state with large electron mass. The latter state is hidden by the phase separation in
the finite-U case.