A novel and physically transparent approach to the finite-temperature Hubbard model at half filling is proposed. It recovers not only the correct dimensionality dependence of antiferromagnetism but, in $d=3\mathrm{}$, interpolates properly between weak and strong coupling interaction strengths for the Néel temperature, and enables extraction of related thermodynamic properties.

• Received 26 September 1994

DOI:https://doi.org/10.1103/PhysRevLett.74.2804