Abstract
The finite temperature magnetic properties of small clusters having N⩽6 atoms are determined in the framework of the single-band Hubbard model by using exact diagonalization methods and by taking into account both electronic and structural excitations. Results are given for the average magnetic moment 〈S〉 and for the spin correlation function 〈Si⋅Sj〉. The temperature dependence in weakly, intermediate, and strongly interacting regimes is analyzed and the role of temperature-induced structural changes is discussed.
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