Abstract
Diagrams are used to present an exact high-temperature low-field series expansion for the Gibbs free energy of the classical n-vector model ferromagnet. It is shown, within the framework of the series expansion method, that, to leading order in (small) n, the zero-field Gibbs free energy and the zero-field susceptibility of the ferromagnet are effectively equal to the self-avoiding polygon and self-avoiding chain generating functions, respectively. The critical point and critical exponents determined by the above properties of the ferromagnet to leading order in n are identified with those of the corresponding self-avoiding walk problem.
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