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  1. 1 Acta Physica Polonica A

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  1. 1 1997

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  1. 1 Cuoco M.

  2. 1 Noce C.

  3. 1 Romano A.

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Ferromagnetism in Hubbard Chains

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Cuoco M., Noce C., Romano A.
Acta Physica Polonica A
|
1997
|
vol. 91
|
issue 2
387-390
EN
We analyze the possible occurrence of ferromagnetism in the Hubbard model, by means of an exact diagonalization study performed on 3- to 8-site chains with periodic boundary conditions. In the case of one hole in the half-filled configuration, we find that the Nagaoka state is reached only in the 3- and in the 4-site case. Ground states characterized by unsaturated ferromagnetism are found when the case of more than one hole is considered.
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