Abstract
A tetrahedral magnetic cluster surrounded by metallic atoms is studied in the framework of the Hubbard model. The ground-state energy and the wave function are obtained exactly using the Lanczos numerical diagonalization method. The spin/spin correlation functions /spl gamma//sub ij/= <S I.oarr="" S="" i="" j="" middot="" spl="" sub="" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"/> and the total spin S are analyzed as a function of the ratio between the on-site Coulomb repulsion U and electronic hopping t.
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